Simrad HT50, HT51 User Manual

ALWAYS AT THE FOREFRONT OF TECHNOLOGY

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Simrad HT50/HT51

Axis 50 GMDSS

Handheld VHF Radio

MANUAL

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Page 4

The technical data, information and illustrations contained in this publication were to the best of our knowledge correct at the time of going to print. We reserve the
right to change specifications, equipment, installation and maintenance instructions without notice as part of our policy of continuous development and improvement.
No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form, electronic or otherwise without prior permission from Simrad
Ltd.
No liability can be accepted for any inaccuracies or omissions in the publication, although every care has been taken to make it as complete and accurate as possible.

11/11/03 MDL/CR

© 2003 Simrad Ltd

For service and advice please contact the main Simrad dealer in your country of residence.

E03766 Issue 1.5

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CONTENTS

1. General

1.1 Introduction

2.

Operation

2.1 Controls

2.2 Selecting Alternative Channel Sets

2.3 Disable / Enable Key Beep

2.4 Keypad Lock

2.5 Removing and Attaching Battery

2.6 Charger Options

2.7 Charging of Batteries

2.8 Battery Level Indicator

2.9 HT51 Accessory Socket

3. Appendix

3.1 Licensing

3.2 Antenna

3.3 Transmission Range

3.4 Frequency of Channels

3.5 Battery Life Guidelines

3.6 Fault Finding

3.7 Spares & Accessories

3.8 Specification & Dimensions

3.9 Service & Warranty

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1 General

1.1 Introduction

The Simrad waterproof handheld VHF com­prises three models -

The HT50 VHF radio is designed for leisure
and light commercial use and meets or
exceeds stringent International Regulations
EN301-178.

The HT51 model has all the features of the
HT50 but also includes an accessory socket for
use with fitmikes, headsets and other third
party accessories.

The Axis 50 model for GMDSS convention
vessels conforms to Pan European specifica­tion ETS300-225 for the use of radios for
Safety at Sea.

All models are waterproof to IP67 standard.
Please note that regulations vary from country

to country. Simrad sets are also approved
specifically by the countries in which they are
sold. Consequently, there may be differences
in the programming of sets bought in different
countries, and therefore in their associated
manuals. If using outside the country of pur­chase, it is vital to check that the set conforms
to local regulations before use.

Thank you for choosing Simrad

If you are pleased with your radio we hope
you will be interested in our range of marine
electronic equipment, which is manufactured
to the same high standards as the HT50.
Please contact your nearest Simrad Agent for
a catalogue showing our increasing range of
high tech navigational instruments, autopilots
and VHF radio sets.

Simrad operate a policy of continual devel­opment and reserve the right to alter and
improve the specification of their products
without notice.

Axis

®

is a Registered Trade Mark of

Simrad Ltd.

HT50 waterproof handheld VHF

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Fig 2.1 - HT50 Controls

1 2

3

4

6

8

10

2 Operation

2.1 Controls

The location of the controls for the HT50 are
shown in Fig 2.1 -

Function

1 On/off
2High/Low power / Keypad Lock
3 PTT (Push T o T alk)
4Volume mode select
5 Squelch mode select
6Up key
7Down key
8 Scan mode
9 Dual /Tri watch
10 Select Priority / Personal channel
11 Backlight on/off & Light Mode select

Pressing and holding certain keys will access
additional functions. These are indicated by
a double beep, or a triple beep if held for
longer (see table below).

5

7

9

11

Key

VOL

SQ

SCAN

D/W

16

Hi/Lo

1 x Press

Select Volume

Mode

Select Squelch

Mode

Standard Mode

Channel Up/Down

Volume Mode

Volume Up/Down

Squelch Mode

Squelch Up/Down

Light Mode

Light level Up/Down

Memory Scan

Dual Watch

Select Channel 16

Select Light Mode

Backlight On/Off

Select 1 or 5 Watt

2 x Press

Add / Delete
channel from
memory scan

Hold During

Power Up

Select secondary

channel set*

Disable / Enable

First Key Beep

* If available

Press & Hold
Doub

le Beep

Scan All Channels

Tri Watch

Select Personal

Channel

Engage/disable

keypad lock

Press & Hold

T

riple Beep

Inhibit /Enable

selected channel

from scan

Set Personal

Channel

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On/Off (1)

Press to turn the HT50 on. To turn off, press
and hold the key for approximately 2 seconds.
This is to avoid accidental power off.

Hi/Lo (2)

Toggles between high and low transmit power
(see specification section 3.8). Use the low set­ting over short ranges to preserve battery life.

VOL - Volume (4)
SQ - Squelch (5)

Press to select Volume or Squelch mode then
use the and keys to adjust the level.

The display shows “VOL” or “SQL” for 3 sec­onds - if or are not pressed within this
time, their function reverts to channel select.

/ (6 & 7)

These keys will change the selected channel.
Pressing VOL, SQ or , then / within 3

seconds will adjust the volume, squelch or
backlighting level respectively. The bargraph
will indicate the level selected.

SCAN mode (8)

Scans through the channels stored in the chan­nel memory (display shows MEM SCAN).

• Select channel and press twice to add/delete
to memory scan (display shows ENT or DEL
respectively). The icon indicates that the
selected channel is included in memory scan.

• Press and hold until double beep sounds to
scan all channels (display shows SCAN).

• Press and hold until triple beep sounds to
inhibit/enable selected channel from scan
(display shows INH or ENA respectively).
The icon indicates the channel is inhibited.

D/W - Dual Watch / Triwatch (9)

Press to select Dual Watch of selected channel
and Ch16. Display shows D/W.

• Press and hold until double beep sounds for
Triwatch - selected channel, personal channel
and Ch 16. Display shows T/W.

a

b

c

d

f

g

i

e

Fig 2.2 - HT50 display functions

aBar graph -

Power up Battery level
Standby Battery level
Transmit Battery Level
Volume Mode Volume Level
Squelch Mode Squelch Level

pressed Backlight level

b Personal channel indicator
c Channel selected
d Receiving or transmitting indicator
e High or Low power indicator
f Function indicator
g Selected channel stored in memory
h Channel inhibited from scan
i Scan mode selected

h

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16 -Channel 16 / Personal Channel (10)

Press to select channel 16.

• Press and hold until double beep to select
personal channel (display shows )

• Press and hold for three beeps to set select­ed channel as the personal channel.

- Backlight (11)

Press to turn on and off. Use / to adjust
the backlighting level (5 levels available). The
bargraph indicates the backlighting level.

• The battery save function turns the back­lighting off if no key is pressed after 20 sec­onds. Press any key (except or ) to turn
light on again.

2.2 Selecting Alternative Channel Sets

In countries where it is permitted, holding
VOL down while turning the radio on will
enable the radio to operate on a secondary
set of channels (Fig 2.3).

Where the display will normally show INT
(International channel set) on the bottom line,
this will show USA for USA channels, CAN
for Canadian channels etc.

• Channel sets available will depend on
which country the radio is programmed for
use in. This function will only be available if per-
mitted in the country of purchase. Please enquire
with your national licensing authority for
details of permitted channel sets.

• The radio will revert to International chan­nels if it is switched off then on again.

2.3 Disable / Enable Key Beep

The HT50 beeps every time a key is pressed to
confirm operation. To disable key beep, press
and hold SQ while turning the set on. Repeat
this procedure to turn the key beep on again.

• Second level functions (such as All Channel
Scan, Triwatch etc) will still be indicated by a
beep, even if the key beep is disabled.

KEEP VOL HELD DOWN

Fig 2.3 - Selecting alternative channel set

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2.4 Keypad Lock
(Not available on Axis50 GMDSS models)

The HT50 keypad can be locked to prevent
accidentally pressing keys while in a pocket
etc.

To lock the keypad, press and hold the Hi/Lo
key. The HT50 will beep twice and any key
pressed will not function - LOCK will appear
in the display.

To disengage keypad lock, press and hold
Hi/Lo again.

Note that the PTT key will still function when
the keypad lock is on, allowing transmission
and receiving as normal.

2.5 Removing and Attaching Batter y

The HT50 is supplied with a 1200mAh NiMH
battery (part no NH12). The Axis 50 GMDSS
radio has two battery options - an 850mAh
NiCad (NC08) or a non rechargeable Lithium
battery (LTB3). Note that Axis 50 batteries

cannot be used with an HT50 and vice
versa.

The batteries are supplied with a label across
the contacts to prevent accidental discharge
while in the box. This label should be
removed before use.

To remove the battery, lift the two locking
clips holding the battery pack in place (Fig

2.4). When reattaching, ensure the two locat­ing pegs on the top of the battery are located
into the slots in the radio and that the two
locking clips have both engaged.

The set is fully waterproof even with the bat­tery removed, but it is recommended that any
moisture on the top of the battery or in the bat­tery compartment is wiped clear before attach­ing to prevent the water creating a conductive
path between the contacts and reducing bat­tery life.

Fig 2.4 - Battery pack removal

Fig 2.5 - Battery charger

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2.6 Charger Options

The HT50 is supplied with a TC50 trickle
charger that will accept the whole radio, or
the battery only (Fig 2.5). The TC50 runs from
a 12.6v-15.5v DC supply or from AC mains
with an appropriate optional adaptor / power
supply. Charging with the trickle charger
takes approximately 12-16 hours. There is
also a rapid charger available (RC50) which
will charge the battery within 1

1

/

2

hours.

2.7 Charging of Batteries

To charge the NiCad and NiMH battery packs,
insert the battery or radio into the charger
ensuring that any moisture is wiped from the
contacts on the back of the battery pack. The
TC50 will trickle charge the battery to full
capacity. The RC50 will rapid charge the bat­tery until it is fully charged and will then
automatically switch to maintenance charge.

• Batteries are supplied uncharged.

• Fully charge the battery when not in use,
although it may lose some of its charge after
several months of storage.

• Do not charge at temperatures below 0ºC or
above 40ºC.

• Turn off radio if charging battery.

• Regularly discharge the battery totally ­repeated recharging of the battery while it is
partly discharged may create a ‘memory
effect’, preventing it reaching full charge.

• Dispose of used batteries carefully. The con­tents of the batteries could be harmful to the
environment.

• Never expose to a naked flame.

• IMPORTANT : The LTB3 Lithium batter y

is not rechargeable,and under no circum­stances should any attempt be made to
recharge it. Replacement batteries can be
re-ordered from your local Simrad Agent.

Fig 2.6 - Charging Options

12v DC

AC

Mains

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2.8 Battery Level Indicator

Except when adjusting the Volume or Squelch,
the bar graph on the display shows the bat­tery charge level (Fig 2.7). This indicates the
voltage at the battery terminals, not necessari­ly the charge stored. Ten or nine bars indicate
a fully charged battery, three or four bars
mean the battery is almost drained.

• A more accurate indication of the battery
state will be obtained by transmitting briefly
on high power. Do not use CH16 for this

purpose.

• When using a lithium battery pack, the low
level battery indicator may flash under trans­mit conditions. This does not necessarily
reflect the charge level remaining in the bat­tery, as it is due to the different voltage char­acteristics of a Lithium battery pack under
load.

2.9 HT51 Accessory Socket

The HT51 features an accessory socket (Fig

2.8) for use with fistmikes, headsets and
boom-mikes etc. The features, functionality
and operation of the HT51 are identical to the
HT50.

Only accessories made specifically for use
with the HT51 should be connected - incom­patible accessories could damage the radio
and invalidate the warranty.

• Switch off the radio before connecting an
accessory to the socket.

Note that the HT51’s internal speaker, micro­phone and PTT button are disabled when the
accessory is connected - these functions are
transferred to the accessory.

For details of compatible accessories available,
contact your Simrad Distributor or the Simrad
Preferred Supplier -

Atlantic Instruments
The Coach House, Trefor, Holyhead, Anglesey
Wales,LL65 1LZ, United Kingdom

Phone [phone]
Fax [phone]
E-mail [e-mail]
Website www.atlanticuk.com

Fig 2.7 - Battery level indicator

Fig 2.8 - HT51 with accessory socket

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3 Appendix

3.1 Licensing

Prior to use check the national licensing requirements for the operator.

In the UK license applications and queries should be made to the following authority -

Ship Radio Licensing

Radio Licensing Centre

The Post Office

PO Box 1495

Bristol

BS99 3QS

A set may only be operated by, or under the supervision of a holder of a Certificate of

Competence and Authority to Operate. This involves a simple examination and an annual
license renewal fee. The VHF only certificate is administered by the Royal Yachting Association -

Royal Yachting Association

RYA House

Ensign House

Hamble

Southampton

SO31 4YA

Tel - 0845 3450400

Holders of the Restricted Certificate of Competence in Radio-telephony (which covers

MF/HF SSB etc), do not need a separate VHF certificate.

In all other countries, please contact your regional authority for information.

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3.2 Antenna

The antenna for the radio is fitted to the unit via a robust screw fitting to an M6 threaded socket
on the top of the radio. This system is more rugged than a traditional BNC connector, so the
radio’s drop-proof integrity is not compromised by the antenna fixing.

While the radio is drop-proof and very robust, damage to the antenna such as bending or kink­ing may adversely affect the transmission efficiency of the unit, which may lead to overloading
of the power module. Damaged antennae should be replaced immediately.

Replacement antennae can be purchased from authorised Simrad Service Agents. Please refer to
section 3.7 for more details on spare parts and accessories available.

3.3 Transmission Range

Because VHF signals travel in a straight line and are not reflected back off the ionosphere as
lower frequency signals are, the range of VHF signals is limited to ‘line of sight’, beyond which
the other vessel passes behind the curve of the Earth. Therefore, the range will increase greatly
the higher above sea level the antenna is, as Fig 3.1 illustrates (assuming maximum transmis­sion power is used):

Therefore, the typical range of a handheld radio such as this one used at sea level will be
approximately 8 Km (5 Miles). This will increase as height above sea level increases, or if the
other radio user ’s antenna is at a greater height - note that the range between the yacht with the
antenna mounted on a 9 M (30 Ft) mast and the handheld user increases to 13-16 Km (8-10
Miles).

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30 m/
100 ft

Mast

9 m/
30 ft

Mast

87 km / 65 M

13-16 km

8-10 M

20 km / 12 M

8 km / 5 M

20-26 km / 12-16 M

46-53 km

/ 29-33 M

Cherbourg Isle of Wight

Endeavour

Niton

Fig 3.1 - VHF transmission range

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3.4 Frequency of Channels

Axis 50 GMDSS models are fitted with simplex channels only.
Ch 70 is restricted for DSC (Digital Selective Calling) use only and is therefore not available on

the HT50 or Axis 50 VHF radio.
Ch 0 will only be made available in the UK to Coastguard users with written authorisation.

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Ai Based on - 5% Transmit at 5 Watts setting of r.f. output power (1.4 Amp)

5% Receive at 200mWatts Audio (0.15Amps)
90% Receiver squelched (0.02Amps)

Aii Based on - 5% Transmit at 1Watt setting of r.f output power (0.8Amp)

5% Receive at 200mWatts Audio (0.15Amps)
90% Receiver squelched (0.02Amps)

B Based on - 10% Transmit at 5Watt setting of r.f. output power (1.4 Amp)

10% Receiver at 250mWatts Audio (0.15Amps)
80% Receiver squelched (0.02Amps)

Charge Held While Stored

The Following Data is Approximate:

BATTERY PACK Typical Life of fully charged pack at 25°C

Duty Cycle Ai Duty Cycle Aii Duty Cycle B

850mAh NiCad 9 hrs 12 hrs 5 hrs
1200mAh NimH 12 hrs 20 hrs 7 hrs

3.5 Battery Life Guidelines

• New batteries should be fully (trickle)
charged and fully discharged several times to
achieve full capacity.

To a large extent, the battery life will depend
on the usage, or Duty Cycle of the radio - i.e
the battery will be drained much quicker if
the radio is transmitting continually than if it
is just receiving. Additionally, if the radio is
set to High Power (5 watts*), the power drain
will be considerably greater than if transmit­ting on Low Power (1 watt*)

* Standard power settings.

Values predicted from calculation -

Battery Pack Duration

At 25 ºC At 45ºC

850mAh NiCad Up to 50% Charge 4-6 Months 4 Weeks
1200mAh NimH Up to 50% Charge 4 Months 4 Weeks

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3.6 Fault Finding

Symptom Possible Cause Remedy

Unit will not switch on • Battery not charged • Re-charge battery

• Battery not attached correctly • Ensure battery is fully
to radio engaged (see section 2.5)

Scan or Memory Scan is • Noise on the channel is • Increase squelch level
locking on a channel holding the scan • Inhibit channel from scan
without a signal

Dual Watch not being • Priority channel selected • Select a working channel
entered (normally Ch16)

Cannot change channel • Dual Watch (D/W) engaged • Exit Dual Watch
Certain channel numbers • Some channels are restricted • Consult your national

are not obtainable and programmed out depend- authority for permitted

ing on country of purchase channels in your region

Will not transmit • Scanning or D/W function active • Exit D/W or Scan
Will not transmit on 5W • Low voltage when full transmit- • Battery charge low -

but OK on 1W ting current is drawn recharge the battery

• Some channels are restricted to • Consult your national
low power transmission only authority

Transmissions persistently • Damaged antenna • Replace antenna
weak

These simple checks should be carried out before seeking technical assistance and may save
time and expense.

Before contacting your servicing agent please obtain the radio’s serial number and the software
iteration - this is shown in the large digits on the display for 2 seconds after the radio is turned
on.

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3.7 Spares & Accessories

The following spares and accessories are available from authorised Simrad Agents. Alist of
dealers is included with this unit. Please quote Part No. when ordering.

ANT3

Spare Antenna

Axis 50 GMDSS Batteries ­NC08

850 mAh NiCad Battery Pack

LTB3

Lithium Battery Pack

(Non rechargeable)

HT50 Batteries ­NH12

1200 mAh NimH Battery Pack

TC50

Trickle Charger

RC50

Rapid Charger

MAT50:U (UK)
MAT50:E (Euro)
MAT50:A (USA)

Mains Adaptors for TC50

MAR50:U (UK)
MAR50:E (Euro)
MAR50:A (USA)

Mains Adaptors for RC50

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3.8 Technical Specification
Electrical

Channel Capability 54 international channels 1-28, 60-69, 71-88

Up to 10 private channels*
UK : includes M (previously 37) and M2
USA : includes 0, 29, 89, 75, 76, Wx1-10 receive only.
Scandinavia : leisure or fishing channels as appropriate.
Canada : Canadian and USA channels.

GMDSS sets have simplex channels only - 06, 08-17, 67-69, 71-74, 77

Frequency Range 155-163Mhz
Operating Temperature Range -20ºC - +60ºC
Output Power HT50 - 1 & 5 Watts Axis 50 GMDSS - 1 & 2.5 Watts
Harmonic and Spurious Emissions <.25µW Tx, <1nW Rx
Sensitivity 0.5µV for 20 dB SINAD
Selectivity 70 dB (±25 kHz)
Intermodulation 70 dB
Channel Spacing 25kHz
Blocking 90dB
Spurious Response 70dB
Audio Output Power Max 0.4 Watt
Current Consumption Squelched <25mA

Receive typically 125mA
Transmit 5 Watts 1.4A

1 Watt 0.8A

Weight 400g including battery pack

* Contact local Simrad Agent for further details of channel programming etc.

Environmental

Waterproof To a depth of 1m fully submersed, including a 45ºC thermal shock

Will withstand petrol, diesel and other fuel oils.

Drop Resistance Will withstand a drop from 1m on to a hard surface on any face.

68mm (2.7 in) 80mm (3.2 in)

145mm (5.8 in)

42mm (1.7 in)

320mm (12.8 in)

70mm (2.8 in)

96mm (3.8 in)

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Page 20

3.9 Service & Warranty

Your radio should seldom need servicing, although it will benefit from an application of silicone
or Teflon grease to the battery contacts and antenna socket each season. For HT51 only, please
ensure the accessory connector is regularly greased.

This unit is guaranteed for 2 years from date of retail sale. If it is necessary to have the unit
repaired, return it carriage prepaid to the agent in the country of purchase with a copy of the
receipted invoice showing the date of purchase. Where possible, return all the components
unless you are certain that you have located the source of the fault. If the original packing is not
available, ensure that it is well cushioned in packing; the rigours of freight handling can be very
different from the loads encountered in the marine environment for which the unit is designed.

IMPORTANT - The HT50 / HT51 / Axis50 are sealed waterproof units. To create and
maintain their waterproof integrity they were assembled in a controlled environment using
special equipment. The radios are not user maintainable units,and UNDER NO
CIRCUMSTANCES should the units be opened, except by authorised Simrad Service
Agents. Unauthorised opening of the unit will invalidate the warranty.

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DECLARATION OF CONFORMITY

English Hereby, Simrad Limited (Margate), declares that this HT50/HT51/Axis50 GMDSS is in

compliance with the essential requirements and other relevant provisions of
Directive 1999/5/EC.

Finnish Simrad Limited (Margate) vakuuttaa täten että HT50/HT51/Axis50 GMDSS tyyppinen laite

on direktiivin 1999/5/EY oleellisten vaatimusten ja sitä koskevien direktiivin muiden ehtojen
mukainen.

Dutch Hierbij verklaart Simrad Limited (Margate) dat het toestel HT50/HT51/Axis50 GMDSS in

overeenstemming is met de essentiële eisen en de andere relevante bepalingen van richtlijn
1999/5/EG

French Par la présente, Simrad Limited (Margate) déclare que ce HT50/HT51/Axis50 GMDSS est

conforme aux exigences essentielles et aux autres dispositions de la directive 1999/5/CE qui
lui sont applicables

Swedish Härmed intygar Simrad Limited (Margate) att denna HT50/HT51/Axis50 GMDSS står i

överensstämmelse med de väsentliga egenskapskrav och övriga relevanta bestämmelser som
framgår av direktiv 1999/5/EG.

Danish Undertegnede Simrad Limited (Margate) erklærer herved, at følgende udstyr HT50/HT51/

Axis50 GMDSS overholder de væsentlige krav og øvrige relevante krav i direktiv 1999/5/EF

German Hiermit erklärt Simrad Limited (Margate), dass sich dieses HT50/HT51/Axis50 GMDSS in

Übereinstimmung mit den grundlegenden Anforderungen und den anderen relevanten
Vorschriften der Richtlinie 1999/5/EG befindet". (BMWi)

Greek Με την παρουσα Simrad Limited (Margate) δηλωνει οτι HT50/HT51/Axis50 GMDSS

συµµορφωνεται προζ τιζ ουσιωδειζ απαιτησειζ και τιζ λοιπεζ σχετικεζ διαταξειζ τηζ
οδηγιαζ 1999/5/ΕΚ

Italian Con la presente Simrad Limited (Margate) dichiara che questo HT50/HT51/Axis50 GMDSS

è conforme ai requisiti essenziali ed alle altre disposizioni pertinenti stabilite dalla direttiva
1999/5/CE.

Spanish Por medio de la presente Simrad Limited (Margate) declara que el HT50/HT51/

Axis50 GMDSS cumple con los requisitos esenciales y cualesquiera otras disposiciones

aplicables o exigibles de la Directiva 1999/5/CE

Portuguese Simrad Limited (Margate) declara que este HT50/HT51/Axis50 GMDSS está conforme com

os requisitos essenciais e outras provisões da Directiva 1999/5/CE.

Website - www.simrad.com

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ALWAYS AT THE FOREFRONT OF TECHNOLOGY

www .simrad.com

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