NAVICO AP44 Autopilot Bundle / Hydraulic / with PUMP-3 1.6L pump - SteadySteer compatible, NAC-3 VRF Autopilot Core Pack, NAC-2 VRF Autopilot Core Pack Manual

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NAC™ -2/NAC™ -3
Commissioning Manual
ENGLISH
www.bandg.com | www.simrad-yachting.com
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Preface

Disclaimer

As Navico is continuously improving this product, we retain the right to make changes to the product at any time which may not be reflected in this version of the manual. Please contact your nearest distributor if you require any further assistance.
It is the owner’s sole responsibility to install and use the equipment in a manner that will not cause accidents, personal injury or property damage. The user of this product is solely responsible for observing maritime safety practices.
NAVICO HOLDING AS AND ITS SUBSIDIARIES, BRANCHES AND AFFILIATES DISCLAIM ALL LIABILITY FOR ANY USE OF THIS PRODUCT IN A WAY THAT MAY CAUSE ACCIDENTS, DAMAGE OR THAT MAY VIOLATE THE LAW.
This manual represents the product as at the time of printing. Navico Holding AS and its subsidiaries, branches and affiliates reserve the right to make changes to specifications without notice.
Governing language
This statement, any instruction manuals, user guides and other information relating to the product (Documentation) may be translated to, or has been translated from, another language (Translation). In the event of any conflict between any Translation of the Documentation, the English language version of the Documentation will be the official version of the Documentation.

Copyright

Copyright © 2020 Navico Holding AS.

Warranty

The warranty card is supplied as a separate document. In case of any queries, refer to the brand website of your unit or system:
www.simrad-yachting.com www.bandg.com
Preface | NAC-2/NAC-3 Commissioning Manual
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Compliance statements

Declarations

The relevant declarations of conformity are available at: www.simrad-yachting.com www.bandg.com

Europe

Navico declare under our sole responsibility that the product conforms with the requirements of:
CE under EMC Directive 2014/30/EU

United States of America

Warning: The user is cautioned that any changes or
modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

Australia and New Zealand

Navico declare under our sole responsibility that the product conforms with the requirements of:
level 2 devices of the Radiocommunications (Electromagnetic
Compatibility) standard 2017

Trademarks

®Reg. U.S. Pat. & Tm. Off, and ™ common law marks. Visit www.navico.com/intellectual-property to review the global trademark rights and accreditations for Navico Holding AS and other entities.
Navico® is a registered trademark of Navico Holding AS.
SIMRAD® is a registered trademark of Kongsberg Maritime AS,
Licensed to Navico Holding AS.
B&G® is a registered trademark of Navico Holding AS.
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Preface | NAC-2/NAC-3 Commissioning Manual
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AP™ is a common law trademark of Navico Holding AS.
NAC™ is a common law trademark of Navico Holding AS.
STEADYSTEER™ is a common law trademark of Navico
Holding AS.
NMEA® and NMEA 2000® are registered trademarks of
the National Marine Electronics Association.

About this manual

Images used in this manual might not exactly match the screen on your unit.

Important text conventions

Important text that requires special attention from the reader is emphasized as follows:
Note:
Ú
Used to draw the reader’s attention to a comment or
some important information.
Warning:
Used when it is necessary to warn personnel that they should proceed carefully to prevent risk of injury and/or damage to equipment/ personnel.

Translated manuals

Available translated versions of this manual can be found on the following website:
www.simrad-yachting.com
www.bandg.com
Preface | NAC-2/NAC-3 Commissioning Manual
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Contents

9 Introduction
NAC-2 and NAC-3 autopilot computers
9 9 Autopilot controllers 9 Autopilot computer setup
12 Dockside setup
12 Data source selection 12 Input function 13 Auto/Standby 13 Disengage 13 SteadySteer 14 Disable input 14 Boat characteristics 14 Drive configuration 17 Rudder setup
20 Sea trial
20 Compass setup 21 Transition speed 22 Set rudder zero position 22 Set turn rate 23 Tuning the autopilot
27 User settings
27 Steering profile settings 28 Sailing parameters 29 Turn pattern settings
33 Installation verification
33 Checklist 33 Boat specific settings
36 Maintenance
36 Preventive maintenance 36 Checking the connectors 36 Software update 36 Resetting the autopilot computer
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38 Technical specifications
38
NAC-2
39 NAC-3
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1

Introduction

NAC-2 and NAC-3 autopilot computers

The NAC-2 and NAC-3 autopilot computers contain the electronics needed to operate a hydraulic steering pump or mechanical drive unit, while also interfacing with rudder feedback units and NMEA 2000 devices.
The NAC-2 is designed for boats up to 10 metres (33 feet) in length and is suitable for low-current pumps, mechanical drive units, or solenoid valves (8 A continuous/16 A peak).
The NAC-3 is designed for boats 10 metres (33 feet) or greater in length and is rated to operate high-current pumps, mechanical drive units, and solenoid valves (30 A continuous/50 A peak).

Autopilot controllers

The NAC can be controlled by various Simrad and B&G control units. This can be dedicated autopilot controllers, Multifunction displays (MFDs) and autopilot remote controllers used in combination with instrument systems, or any combination of the above.

Autopilot functions

NAC-2 and NAC-3 include a large range of functions, but not all autopilot controllers have access to all options. E.g. autopilot systems including only an autopilot remote controller (without display unit) do not have access to turn patterns.

The user interface

The autopilot functions are presented slightly different on the different displays.
This manual shows screen examples from both MFDs and AP48.

Autopilot computer setup

When the autopilot installation is completed, the setup of the autopilot computer must be performed. Failure in setting up the autopilot correctly may prohibit the autopilot from functioning properly.
The setup of the autopilot computer is divided in two main steps:
Introduction | NAC-2/NAC-3 Commissioning Manual
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Installation settings
-
Including dockside and seatrial commissioning. See "Dockside setup" on page 12 and "Sea trial" on page 20
User adjustment of autopilot settings
- Manual fine-tuning for various operational conditions and user preferences. See "User settings" on page 27
Note: Dockside settings can only be accessed when the
Ú
autopilot is in Standby mode.
Note: Some systems require a dedicated physical standby key
Ú
to perform installation procedures. This key can be a key on the autopilot controller, on an autopilot remote controller, or it can be a separate standby key.
Warning: When the autopilot is delivered from
factory and any time after an autopilot reset has been performed, the installation settings are all reset to factory preset (default) values. A notification will be displayed, and a complete setup has to be made. Failure to do so correctly may prohibit the autopilot from functioning properly!
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Installation setup workflow

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2

Dockside setup

Data source selection

Before commencing with autopilot computer setup the data sources must be available and configured.
Data sources selection is required on initial start-up of the system, if any part of the network has been changed or replaced, or if an alternative source is made available for a given data type and this source has not been selected automatically.
You can let the system automatically select your sources, or set up each source manually. Refer to documentation for the autopilot controller or for the display unit for details about how to perform the data source selection.

Input function

Determines |how the autopilot computer/system reacts to an external input. External input can be connected to blue/yellow wire on NAC-2 and mode/function selector on NAC-3. For wiring details and options, refer to the installation documentation.
12
Autopilot installation dialog, MFDs
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Autopilot installation dialog, AP48

Auto/Standby

Select this mode if you have a toggle button connected to your NAC-2 autopilot computer. Press the button to toggle between Auto and Standby mode.

Disengage

Select this mode if you have a disengage switch connected to your NAC-3 autopilot computer.
OPEN – Normal operation, can be controlled by controller.
CLOSED to OPEN – Activates Auto mode regardless of previous
state.
CLOSED – Disengaged. Cannot be controlled by controller.

SteadySteer

Select this mode if you have a SteadySteer connected to your NAC-2/NAC-3.
Manual steering overrides the active mode.
If Auto mode or NoDrift mode was active before going into
manual steering, they will automatically re-engage when the vessel has stabilized on a new course.
For any other modes, the autopilot goes into Standby mode.
If NAV mode was active before going into manual steering a
dialog will be shown.
- Confirm course change to reactivate NAV mode.
- Cancel the course change to activate Auto mode on the new heading.
If no action is taken the autopilot will go into Standby mode.
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Disable input

Select if no external input is connected or to disable connected input.

Boat characteristics

Boat type

Affects steering parameters as well as available autopilot features. The following options are available:
Sail
Displacement
Planing
Note: If the boat type is set to Sail, Virtual Rudder Feedback is
Ú
not available.

Boat length

Used by the autopilot system to calculate steering parameters.

Cruising speed

Used if no speed info is available. It is used by the autopilot system to calculate steering parameters.
14

Drive configuration

The drive configuration controls how the autopilot computer operates the steering system.
Refer to your drive unit documentation for relevant specifications.

Control method

Used for setting the appropriate control ouput for your drive. The following options are available:
Solenoid
For on/off steering of hydraulic valves. Gives fixed rudder speed.
Reversible motor
For variable speed pumps/drives.
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Drive voltage

Nominal drive voltage specified for your drive unit.
Options: 12 V and 24 V.
Note: 24 V output is only available with 24 V supply.
Ú
The setting must match the spec of the solenoids/pump/motor.
Warning: Selection of improper voltage level for your
drive unit may damage both the drive unit and the autopilot computer even if the protection circuits are activated.

Drive engage

Defines how the Engage output is used. The following options are available:
Clutch
If your drive unit/motor/pump needs clutch to engage the actuator, it shall be connected to the "engage" output. Configure the "Drive engage" as clutch. The clutch will be activated when autopilot computer is controlling the rudder. In standby, the clutch is released to allow manual steering. Check specification of your drive unit to determine whether clutch is required.
Auto
Output activated when autopilot computer is in Auto, NoDrift or Navigation modes. For manual rudder control (Standby, NFU and FU) the output is not activated. Typically used to switch between two rudder speeds on a continuous running pump, used when different rudder speeds are required for automatic and Follow­up/Non-Follow-up steering.

Minimum rudder

Some boats may have a tendency to not respond to small rudder commands around the “course keeping” position because of a small rudder, whirls/disturbance of the water-stream passing the rudder, or it is a single nozzle water jet boat. By increasing the Minimum rudder parameter you may improve the course keeping
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performance on some boats. However, this will increase the rudder activity.
Note: Only set a value for minimum rudder if it proves to give a
Ú
better course keeping performance in calm sea. It should be set after the autopilot steering parameters have been optimised/ tuned.

Rudder deadband

Prevents the rudder from hunting induced by mechanical play in the steering gear or rudder.
The following options are available
Auto
(Recommended). The rudder deadband is adaptive and is continuously operative. It will also optimize the deadband to the pressure on the rudder
Manual
If the Auto setting doesn’t perform properly due to extreme rudder speed and/or overshoot, it can be adjusted manually. Can also be used to reduce the rudder activity. Rudder commands smaller than the size of the dead band will be ignored
Find the lowest possible value that will prevent the rudder from continuous hunting. A wide deadband will cause inaccurate steering. It is recommended to check rudder stability in AUTO mode at cruising speed to get pressure on the rudder. (Slight hunting observed dockside may disappear at cruising speed.)
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Rudder setup

Warning: During the rudder calibration and test the
autopilot computer issues a series of rudder commands. Stand clear of the helm and do not attempt to take manual control of the rudder during this test!

Rudder source

The correct rudder source has to be selected before the rudder feedback calibration can be performed.
Rudder source selection, MFDs
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Rudder source selection, AP48

Rudder feedback calibration

Note: Only available if you have a rudder feedback unit installed
Ú
and selected as rudder source.
The rudder feedback calibration determines the rudder feedback's direction.
Follow the on-screen guided steps until the rudder calibration is
completed.

Rudder test

This rudder test verifies the drive direction. It detects minimum power to drive the rudder and reduces the rudder speed if it exceeds the maximum preferred speed for autopilot operation.
Note: If the boat uses power assisted steering, it is important
Ú
that the engine or electric motor used to enable the power assist steering is turned on prior to this test.
Run the rudder test as described in the on-screen instructions
-
Rudder should make a small movement within 10 seconds, then follow up with travelling both directions
18
Failure to complete test will result in an alarm.

VRF calibration

Note: Only available if the rudder source is set to a virtual
Ú
rudder feedback.
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VRF calibration determines the direction of rudder movement, the minimum output required to move the rudder and the voltage to rudder speed ratio.
To perform the VRF calibration you must be able to view the movement of the rudder.
Follow the on-screen guided steps until the VRF calibration is
completed.
Note: When you get asked if the rudder moved you may have
Ú
to select no several times to ensure the pump provides enough power to turn the motor at high vessel speed.
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3

Sea trial

A seatrial can only be performed after the dockside settings are completed.
Note: The seatrial must always be performed in calm
Ú
conditions, in open waters and at a safe distance from other traffic.

Compass setup

To achieve the best possible performance, the compass should be calibrated, and any offsets should be compensated for.
The setup needs to be done from an appropriate display unit. Depending on the unit, access to the compass setup is available from the compass’s device dialog, or from a dedicated Calibration option in the unit’s Settings menu.
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Device dialog, MFDs
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Calibration option, AP48
Note: The setup of the compass should be done in calm sea
Ú
conditions and with minimal wind and current to obtain good results. Ensure that there is enough open water around the vessel to make a full turn.
Refer to your heading sensor's documentation for further details for your unit.

Transition speed

Note: Only available if the boat type is set to Planing.
Ú
The transition speed is the speed at which the system automatically changes between Low speed and High speed profiles.
The profiles are used to accommodate the boats' tendency to exhibit different steering characteristics at different speeds. You may also have different preferences about the steering performance of your boat required at low and high speeds.
It is recommended that you set a value that represents the speed where the boat's steering characteristics change. For instance the planing threshold (recommended), or at the speed you want the autopilot to change behavior.
There is a 2 knots hysteresis to prevent oscillation of high/low settings when the vessel is travelling at or near the transition speed.
Example The transition speed is set to 9 knots.
The system changes from Low profile to High profile when the
speed increases to 10 knots (= Transition speed plus 1 knot)
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The system changes from High profile to Low profile when the
speed decreases to 8 knots (= Transition speed minus 1 knot)
The active profile ('Low' or 'High') is shown in the autopilot page (e.g. AP44) and in the autopilot pop-up (MFDs):
AP48 page MFD Autopilot control bar

Set rudder zero position

Used to correct the rudder zero position found during dockside commissioning if the boat needs a small rudder offset in order to steer straight.
Note: Setting rudder zero position should always be done in
Ú
calm conditions, where steering is not affected by wind and/or current.
Bring the rudder to the position where the boat steers straight, then activate the Set rudder zero option to save the rudder zero parameter.
22
Note: On dual engine boats, verify that the engine RPM is equal
Ú
on both engines so that the thrust from both propellers is equal. Otherwise, the zero rudder position might be set wrong.

Set turn rate

Used for setting the preferred turn rate of the boat. Bring the boat into a turn with the preferred safe and comfortable
turn rate, then activate the Set turn rate option to save the turn rate parameters.
Note: The captured turn rate will be stored in the active
Ú
steering profile. This setting must therefore be repeated for each steering profile.
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Tuning the autopilot

Note: Tuning of the autopilot must be done separately for low
Ú
and high speed profiles. Both Autotune and manual tuning should be performed in calm or moderate sea conditions.
Providing you have entered correct vessel type, length and cruising speed, you may not have to perform further manual or automatic tuning.
Proceed as follows to verify satisfactorily steering:
1. Stabilize the vessel on a heading, and then select AUTO mode
2. Observe course keeping and rudder commands
-
The autopilot should keep the vessel on the set heading within an average of +/-1 degree, providing calm sea and wind
3. Make some small and bigger heading changes to port and
starboard and observe how the vessel settles on the new heading
- The vessel should have a minimum of overshoot. See "Rudder gain" on page 25 and "Counter rudder" on page 25.
If the autopilot is not keeping the heading satisfactorily or not making the turns satisfactorily, you may now either try the Autotune function or go directly to manual tuning.
Note: If the vessel is more than approximately 30 m/100 ft or
Ú
has a very high cruising speed it may be unpractical to perform Autotune. It is then suggested to proceed with manual tuning.

Autotuning

When performing an autotune, the vessel will automatically be taken through a number of S-turns. Based on the vessel behavior, the autopilot will automatically set the most important steering parameters (Rudder gain and Counter rudder).
Stabilize the vessel on a heading and set the speed between 5-10
kn, then select Autotune.
The autopilot will now switch to AUTO mode and take control
­of the vessel.
Note: Autotuning can be stopped at any time by pressing the
Ú
STBY key on the autopilot controller.
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The autotuning takes approximately 3 minutes to complete. When completed the autopilot automatically switches to Standby mode, and the rudder must be controlled manually.
Note: All parameters that are set during autotuning can be
Ú
manually adjusted. For optimal steering performance it is recommended to manually adjust the steering parameters after running the autotune.

Manual tuning

Rudder gain and Counter rudder can be manually adjusted.
Stabilize the vessel on a heading and set the speed in the middle
of the profile range (well clear of the transition speed) to avoid profile switching during tuning. Then activate the Rudder gain option. Adjust the value according to the descriptions below.
If required, adjust slightly the Counter rudder option.
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Tuning parameters, MFDs
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Tuning parameters, AP48
A
B
Rudder gain
This parameter determines the ratio between commanded rudder and the heading error. The higher rudder gain value the more rudder is applied. If the value is too small it will take a long time to compensate for a heading error, and the autopilot will fail to keep a steady course. If the value is set too high the overshoot will increase and the steering will be unstable.
A The value is set too high. Steering becomes unstable and
often the overshoot will increase
B The value is set too low. It will take a long time to
compensate for a heading error, and the autopilot will fail to keep a steady course
Counter rudder
Counter rudder is the amount of counteracting (opposite) rudder applied to stop the turn at the end of a major course change. The settings depend on vessel’s characteristics, inertia, hull shape and rudder efficiency.
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If the vessel has good dynamic stability, a relatively small value
A B C
will be sufficient
An unstable vessel will require high value
The greater the vessel’s inertia, the greater value will be required
Increasing counter rudder value may result in some higher rudder activity also when steering a straight course, particularly in high waves.
The best way of checking the value of the Counter rudder setting is when making turns. The figures illustrate the effects of various Counter Rudder settings.
A Counter rudder value too low; overshoot response
B Counter rudder value is too high; sluggish and creeping
response
C Correct setting of Counter rudder; ideal response
Perform various course changes and observe how the boat settles on the new heading. Start with small changes, 10-20 degrees, and proceed with bigger changes, 60-90 degrees. Adjust Counter rudder value to obtain best possible response as in illustration C.
Note: As many boats turns differently to port versus starboard
Ú
(due to propeller rotation direction), do the course changes in both directions. You may end up with a compromise setting of Counter rudder that gives a little overshoot to one side and a bit creeping response to the other.
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4

User settings

The user settings can be configured differently between the different profiles, depending on boat steering characteristics and user preferences.

Steering profile settings

The NAC include two steering profiles (High and Low), used for high and low boat speed.
The initial parameters are automatically assigned when you select your vessel type. During the seatrial the parameters will be tuned for optimized steering performance. See "Tuning the autopilot" on page 23.
The options listed in the next pages are available for both High and Low speed profiles.
For Rudder gain and Counter rudder, see "Rudder gain" on page 25 and "Counter rudder" on page 25.

Turn rate

Used for manually setting the turn rate used when the heading change is larger than 5°.

Autotrim

Controls how fast the autopilot will apply rudder to compensate for a constant heading offset, e.g. when external forces such as wind or current affects the heading. Lower autotrim will give faster elimination of a constant heading offset

Init rudder

Defines how the system moves the rudder when switching from hand steering (Standby, FU and NFU) to an automatic mode.
The following options are available:
Center
Moves the rudder to zero position
Actual
Maintains the rudder angle, and assumes that the current rudder angle is the trim required to maintain a steady heading.
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Rudder limit

Determines the dynamic range of the rudder before its movement is restricted and alarm is triggered. Typical usage is to limit the amount of rudder action caused by yawing in following sea.
Note: Rudder limit is not a hard limitation of the rudder range,
Ú
only around the current setpoint.
This Rudder limit does not affect Non-Follow-up or Follow Up steering.

Off heading limit angle

Sets the limit for the off heading alarm. When the alarm option is activated an alarm occurs when the actual
heading deviates from the set heading more than the selected limit.

Track response

Defines how aggressively the autopilot should steer towards the active route's leg.

Track approach angle

This setting is a limit to prevent approaching the track too steeply. Approaching the track at shallower angles is permitted depending on the cross track distance (XTD) and track response setting.
This setting is used both when you start navigating and whenever the autopilot is working the boat towards the route.
28

Course change confirm angle

Defines the limit for automatic course change to next waypoint in a route when the autopilot is following a route (NAV mode).
If the course change is greater than this set limit, you are prompted to verify that the upcoming course change is acceptable.

Sailing parameters

Note: Only available if the boat type is set to SAIL.
Ú

Wind mode

Select what wind angle the autopilot will steer towards.
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The following options are available:
Auto
If True Wind Angle (TWA) is <70º: Wind mode will steer towards Apparant Wind Angle (AWA) If TWA is ≥70º: Wind mode will steer towards TWA
Apparent
Steers towards AWA
True
Steers towards TWA

Tack time

Controls how fast the autopilot tacks in wind mode.

Tack angle

Controls the angle that the boat will tack to in AUTO mode.

Manual speed

If neither boat speed nor SOG data are available and/or deemed unreliable, a manual value for speed can be entered and used by the autopilot to aid steering calculations.

Turn pattern settings

The autopilot computer supports a number of automatic turn steering features when the autopilot is in AUTO mode.
Note: Turn pattern steering is not available if the boat type is
Ú
set to Sail.
All turn patters, except the U-turn, have associated turn pattern settings. Depending on the autopilot controller these turn pattern settings can be adjusted before you start the turn or during the turn.
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Turn pattern settings, MFD
Turn pattern settings, AP48
Note: Not all autopilot controllers include turn pattern steering.
Ú
Refer to your autopilot controller for more information.

C-turn (Continuous turn)

Steers the vessel in a circle.
Turn variable:
-
Rate of turn. Increasing the value makes the vessel turn a smaller circle.
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U-turn

B A
Changes the current set heading to be 180° in the opposite direction.

Spiral turn

Makes the vessel turn in a spiral with a decreasing or increasing radius.
Turn variables:
-
Initial radius
- Change/turn. If this value is set to zero, the boat will turn in a circle. Negative values indicate decreasing radius while positive values indicate increasing radius.

Zigzag turn

Steers the vessel in a zigzag pattern.
Turn variables:
- Course change (A)
- Leg distance (B)

Square turn

Makes the vessel automatically turn 90° after having travelled a defined leg distance.
Turn variable:
- Leg distance

S-turn

Makes the vessel yaw around the main heading.
Turn variables:
- Course change (C)
- Turn radius (D)
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D
C

Depth contour tracking (DCT)

Makes the autopilot follow a depth contour.
Note: DCT turn pattern is only available if the system has a valid
Ú
depth input.
Warning: Do not use the DCT turn pattern unless the
seabed is suitable. Do not use it in rocky waters where the depth is varying significantly over a small area.
Turn variables:
-
Depth gain. This parameter determines the ratio between commanded rudder and the deviation from the selected depth contour. The higher depth gain value the more rudder is applied. If the value is too small it will take a long time to compensate for drifting off the set depth contour, and the autopilot will fail to keep the boat on the selected depth. If the value is set too high the overshoot will increase and the steering will be unstable.
- CCA. The CCA is an angle that is added to or subtracted from the set course. With this parameter you can make the boat yaw around the reference depth with s movements. The larger the CCA the bigger yawing will be allowed. If the CCA is set to zero there is no S-ing.
- Ref. depth. This is the reference depth for the DCT function. When DCT is initiated the autopilot reads the current depth and set this as the reference depth. The reference depth can be changed when the function is running.
32
Note: If depth data is lost during DCT the autopilot will
Ú
automatically switch to AUTO mode. It is recommended to turn ON the AP Depth Data Missing alarm when using DCT. When this alarm is activated an alarm will be raised if the depth data is lost during DCT.
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5

Installation verification

When all units in the autopilot system are installed, external equipment connected and the software configured according to the previous chapters, the installation should be verified according to the checklist. The boat specific settings should be noted down in the relevant tables included this chapter.

Checklist

Description Reference
Units mounted and secured according to instructions
Network powered and terminated according to instructions
Sources selected
Vessel configured "Boat characteristics" on page 14
Drive units configured and calibrated
Compass calibrated "Compass setup" on page 20
Seatrial completed (manual or autotune)
Installation instructions for the units
Wiring instructions for the units
Autopilot control unit documentation
"Drive configuration" on page 14
"Sea trial" on page 20

Boat specific settings

Boat

Settings
Boat type
Boat length
Cruising speed
Transition sped
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Drives

Settings
Drive type
Drive control method
Nominal drive voltage
Drive engage
Minimum rudder
Rudder deadband
Manual deadband
Minimum output
Maximum output

Sailing parameters

Settings
Wind mode
Tack time
Tack angle
Manual speed
34

Steering profiles

Settings Low Speed High Speed
Turn Rate
Rudder gain
Counter rudder
Autotrim
Init rudder
Rudder limit
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Manual
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Settings Low Speed High Speed
Off heading limit
Track response
Track approach angle
Course change confirm angle

Turn Pattern settings

Settings
Continuous
Rate of turn
Spiral
Initial radius
Change/turn
Zigzag
Course change
Leg distance
Square
Leg distance
Lazy-S
Course change
Turn radius
Depth contour
Depth gain
CCA
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6

Maintenance

Preventive maintenance

The unit does not contain any field serviceable components. Therefore, the operator is required to perform only a very limited amount of preventative maintenance.

Checking the connectors

The connectors should be checked by visual inspection only. Push the connector plugs into the connector. If the connector plugs
are equipped with a lock, ensure that it is in the correct position.

Software update

You can update the software for the autopilot computer from a display unit connected to the network.
You can check the autopilot computer's software version from the display unit's Device list.
The latest software is available for download from the product website on www.simrad-yachting.com and www.bandg.com.

Resetting the autopilot computer

You can reset the autopilot to factory default settings.
36
Reset autopilot computer, MFDs
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Reset autopilot computer, AP48
The first time the autopilot computer is started after reset, it will run through the automatic setup-procedure.
Note: Unless you need to clear all values set during the
Ú
installation set-up procedure, you should not perform a reset of the autopilot computer.
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7

Technical specifications

Note: The most up-to-date specifications list is available at:
Ú
www.simrad-yachting.com

NAC-2

Approvals
Compliance EMC directive 2014/30/EU
Electrical
Supply voltage 9-31.2 V DC
Power consumption - Max 500 W
Power consumption - Typical As required to drive rudder
actuator. See pump/motor power ratings
Recommended fuse rating 20 A
Environmental
Operating temperature -25°C to +55°C (-13°F to 131°F)
Storage temperature -30°C to +70°C (-22°F to 158°F)
Waterproof rating IPx5
Humidity 100%
Shock and vibration Acc to EN60945
Connectivity
NMEA 2000 1 Micro-C port, 1 LEN
Drive 12/24 V DC, min 10 mA, max 3 A
Rudder Feedback Variable voltage/resistive 05 V
Physical
Weight 0.6 kg (1.3 lbs)
Compass Safe Distance 500 mm (20 inches)
Warranty 2 years
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Technical specifications | NAC-2/NAC-3 Commissioning
Manual
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NAC-3

Approvals
Compliance EMC directive 2014/30/EU
Electrical
Supply voltage 12/24 V DC +/- 10-30%
Power consumption - Max 750 W
Power consumption - Typical As required to drive rudder
actuator. See pump/motor power ratings
Recommended fuse rating 30 A
Environmental
Operating temperature -25°C - +55°C (-13°F - 131°F)
Storage temperature -30° - +70°C (-22°F - 158°F)
Waterproof rating IPx5
Humidity 100%
Shock and vibration Acc to EN60945
Connectivity
NMEA 2000 1 Micro-C port, 1 LEN
NMEA 0183 1 port IN/OUT. 4.8, 9.6,
19.2 & 38.4 kbaud
Drive Reversible motor control
of rudder. Max continuous load 30 A, peak 50 A for 1s
or
On/off
solenoid control of rudder. 12/24 V DC, common, load range 10 mA to 10 A, off current <1 mA
Engage Output for bypass/clutch. 12/24
V DC, min 10 mA, max 3 A
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Rudder Rudder angle, frequency input.
15 V, 1.4 to 5 kHz, resol. 20 Hz/°
Remote Input: External open/
close contact for remote controller
Output: High/Low mode
indicator signal
Mode External open/close
or pulse contact for autopilot disengage
Alarm External alarm output for
buzzer/relay. Max 100 mA, voltage level as local supply
Physical
Weight 0.7 kg (1.6 lbs)
Compass Safe Distance 500 mm (20 inches)
Warranty 2 years
40
Technical specifications | NAC-2/NAC-3 Commissioning
Manual
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*988-11233-003*
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