Garmin GMR 40, GMR 20 User Manual

GMR 20/40

Marine Radar

Owner’s Manual

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INTRODUCTION > ABOUT THIS MANUAL

INTRODUCTION

Terminology used Throughout this Manual

• This manual refers to the radome hardware as the “scanner,”

About This Manual

Congratulations, and thank you for choosing Garmin’s GMR 20/40
Marine Radar. The addition of the GMR 20/40 Marine Radar to your
Garmin Marine Network, enhances the capability of your system by
adding graphical radar data to your Garmin Marine Network.

This manual covers the features and operation of the GMR 20/40
Marine Radar when viewed on the Garmin Marine Network
Chartplotters. To get the most out of your new radar, take time to read
this manual and learn the operating procedures for your unit in detail.

Introduction:

manual and the Table of Contents.

Main Pages: The Main Pages contain information on the setup and
operation of the GMR 20/40.

Appendix: The Appendix contains information such as specifications,
and license requirements. You can also find warranty and FCC
information in the Appendix.

Index: Use the Index as a key word search to help you find
information more quickly.

The introduction contains information about this

• This manual uses the term “chartplotter” when referring to a

• This manual uses the term “Radar Page.” The Radar page is

• This manual uses the term “

“Radar,” or “GMR 20/40.” These terms can be used
interchangeably.

Garmin GPSMAP 3000 series Multi Function Display.

a dedicated page on the Garmin chartplotter showing radar
information. Radar information can be displayed as a split
screen on any of the chartplotter main pages.

highlight” when referring to the on­screen cursor. To highlight something, use the Arrow Keypad
on the chartplotter to move the cursor to the desired item. The
on-screen cursor is represented by changing the color of the
highlighted box to yellow.

GMR 20/40 Owner’s Manual i

INTRODUCTION > TABLE OF CONTENTS

Introduction ...........................................................................i

About This Manual ................................................................... i

Terminology used Throughout this Manual ........................... i

GMR 20/40 Operation ..........................................................1

Radar Overview ....................................................................... 1

The Radar Page ....................................................................... 1

Radar Page Layout .......................................................................... 3

Range Rings .............................................................................. 4

Heading Line ............................................................................. 4

Digital Navigation Data ............................................................ 4

The Radar Configuration Page ............................................... 5

The Radar Adjustment Menu .................................................. 5

Gain ................................................................................................ 6

Sea Clutter ......................................................................................6

Rain Clutter ..................................................................................... 7

FTC (Fast Time Constant) .............................................................. 7

Zoom ............................................................................................... 8

Target Expansion ............................................................................8

Trails ............................................................................................... 9

Guard Zone ..................................................................................... 9

VRM/EBL ..................................................................................... 10

MARPA ......................................................................................... 11

MARPA Setup .............................................................................12

Hide/Show Navigation Features ................................................... 13

Additional Adjustment Menu Items ............................................. 13

Map Cursor On/Off ....................................................................... 14

Setup ............................................................................................. 14

The General Tab ...................................................................... 14

The Display Tab ...................................................................... 15

The MARPA Tab ..................................................................... 16

The Advanced Tab ..................................................................16

Enter Standby/Begin Transmitting ............................................... 17

Map Page Radar Overlay ...................................................... 17

Appendix ............................................................................19

European License Requirements ........................................ 19

Specifications ........................................................................ 20

FCC Compliance .................................................................... 21

Software License Agreement ............................................... 22

LIMITED WARRANTY ............................................................ 22

Warning and Cautions .......................................................... 24

ii GMR 20/40 Owner’s Manual

GMR 20/40 OPERATION > RADAR OVERVIEW—THE RADAR PAGE

GMR 20/40 OPERATION

When the new radar is detected, the chartplotter automatically adds
a dedicated Radar page to the page list. If the Radar page is not

Radar Overview

The Garmin GMR 20/40 Radar Scanner transmits a narrow beam of
microwave energy in a rotating 360° pattern. When the transmitted

available, press and hold the ADJ/MENU key until the Main Menu is
displayed. Using the ARROW KEYPAD, highlight the System tab,
and select Radar from the Services list at the bottom of the page.

energy contacts a target, some of that energy is reflected and returned
to the scanner. The scanner collects the returned energy for processing
and display. The GMR 20/40 is operated and adjusted using the
controls on your Gamin chartplotter. Radar data is presented on a
dedicated Radar page, or as an overlay on the Map page. All radar
controls are accessible on both pages.

To Select the Radar page for display:

1. Press the PAGE key to display the Pages list.

2. Using the ARROW KEYPAD, select Radar.

3. Press the ENTER key.

The Radar Page

With the GMR 20/40 Radar properly installed, at power up, the
Garmin chartplotter should detect the GMR 20/40 as a new network
connection.

Note: A software update may be needed for the GMR 20/40
to function properly. If the message “Incompatible Software
Version” is displayed when the chartplotter is powered on, the
software in the chartplotter needs to be updated. A software
update card is provided with the GMR 20/40.

Pages List

GMR 20/40 Owner’s Manual 1

GMR 20/40 OPERATION >THE RADAR PAGE

In the Status Bar at the top of the Radar page, the message “Radar
Warming Up” is displayed with a countdown to Standby Mode. The
countdown to Standby Mode is also displayed in the middle of the
radar display. When the countdown reaches zero, the message “Hold
FCTN to transmit” is displayed.

As a safety feature, the scanner enters Standby Mode after it is
warmed up. This provides the operator an opportunity to verify
that the area around the scanner is clear before beginning radar
transmission. It is important to remember that the microwave energy
transmitted by the scanner can potentially be dangerous.

When the area surrounding the scanner is clear, press and hold the
FCTN key. The message “Do you want to begin radar transmission?”
is displayed. Select Yes, then press the ENTER key. Before
transmission begins, the message “Spinning Up” is displayed while
the radar antenna reaches nominal rotation speed. When the message
disappears, the radar begins painting an image.

Caution: The GMR 20/40 Radar transmits microwave energy that
has the potential to be harmful to humans and animals. Before
beginning radar transmission, verify that the area around the
scanner is clear. The GMR 20/40 transmits a beam approximately
12° above and below a line extending horizontally from the center
of the scanner. Avoid looking directly at the scanner as the eyes
are the most susceptible part of the body.

2 GMR 20/40 Owner’s Manual

GMR 20/40 OPERATION > RADAR PAGE LAYOUT

Radar Page Layout

This section describes the features of the Radar page and how its features are displayed. By default, the Radar page displays a Status Bar along
the top, user configurable Digital Navigation Data down the right side, a Heading Line, and Range Rings. Soft Key options that allow the user
to quickly access functions and change settings may be displayed along the bottom of the page.

Status Bar

Range Rings

Heading Line

Zoom Scale

Ring Separation

GMR 20/40 Owner’s Manual 3

GMR 20/40 Owner’s Manual 3

Digital

Navigation

Data

Soft Key Options

GMR 20/40 OPERATION > RANGE RINGS—HEADING LINE—DIGITAL NAVIGATION DATA

Range Rings

The Range Rings are used as an aid to quickly determine distance to
a target. In the lower right corner of the display are two scales. The

Heading Line

The Heading Line is shown from your current position along the path

of your current heading.
upper scale is the current zoom scale. This scale is changed using the
RANGE keys. The Zoom Scale is represented by the Range Ring
with tick marks around the circumference. The tick marks are arrange
with a minor tick marks every five degrees and major tick marks
at thirty-degree increments. These tick marks can aid in quickly
determining the azimuth to a target. The lower scale represents the

Digital Navigation Data

By default, the Radar page shows one column of digital navigation

data with four data fields. The Radar page can be configured to show

two columns of data with up to seven data fields each. Each data field

can be configured to show a variety of data.

distance between the Range Rings.

3/4 nm

1/2 nm

1/4 nm

4 GMR 20/40 Owner’s Manual

GMR 20/40 OPERATION > THE RADAR CONFIGURATION PAGE—THE RADAR ADJUSTMENT MENU

The Radar Configuration Page

The Radar Configuration page is used to change the look of the Radar
page. Please refer to the GPSMAP 3000 series Owner’s Manual for
information on “Configuring the Main Pages.”

To display the Radar Configuration page:

Press and hold the DATA\CONFIG key.

The Radar Adjustment Menu

The Radar Adjustment Menu is a numbered list of options that allow

direct access to the settings and features most commonly used on the

Radar Page. There are several adjustment options available: Gain, Sea

Clutter, Rain Clutter, FTC, Zoom, Target Expansion, Trails, Guard

Zone, VRM/EBL, MARPA, and Hide/Show Navigation Features. All

adjustments are made using the Arrow Keypad, or Data Entry Keys.

Radar Configuration Page

Radar Adjustment Menu

GMR 20/40 Owner’s Manual 5

GMR 20/40 Owner’s Manual 5

GMR 20/40 OPERATION > THE RADAR ADJUSTMENT MENU

continued

To change a Radar Adjustment Menu setting:

1. Press the ADJ key to display the Adjustment Menu.

2. Using the ARROW KEYPAD or DATA ENTRY keys, select
an option. If using the ARROW KEYPAD to highlight an
option, press the ENTER key to display the adjustment for that
selection.

3. Using the ARROW KEYPAD, make the desired change, then
press the ENTER key to accept the change.

Gain

Selecting Gain, displays the Gain Adjustment Slider. When Auto

To return the Gain setting to Auto, move the slider to the Auto
position, or press the Auto Soft Key.

Sea Clutter

Sea Clutter is screen clutter caused by choppy sea conditions.
Adjusting the Sea Clutter setting can help eliminate the screen clutter.
Selecting Sea Clutter displays the Sea Clutter Adjustment Slider. The
slider has three preset positions: Calm, Moderate, and Rough.

is selected, the Scanner Gain is automatically adjusted to provide
optimal performance.

To change the Gain setting:

1, Using the ARROW KEYPAD, move the slider up or down.

2. Press the ENTER key to accept the change.

6 GMR 20/40 Owner’s Manual