Garmin GNX 120 7_inch Installation Instructions

Garmin Instruments Installation Instructions - GNX 120 7_inch.
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GNX™ 120/130

Installation Instructions

Important Safety Information

 WARNING

See the Important Safety and Product Information guide in the 

product box for product warnings and other important 

information.

 CAUTION

Always wear safety goggles, ear protection, and a dust mask 

when drilling, cutting, or sanding.

NOTICE

When drilling or cutting, always check what is on the opposite 

side of the surface.

Registering Your Device
Help us better support you by completing our online registration 

today.
• Go to http://my.garmin.com.
• Keep the original sales receipt, or a photocopy, in a safe 

place.

Contacting Garmin® Product Support
• Go to http://www.garmin.com/support for in-country support 

information.

• In the USA, call 913-397-8200 or 1-800-800-1020.
• In the UK, call 0808 238 0000.
• In Europe, call +44 (0) 870 850 1241.

Tools Needed
• Drill and drill bits

◦ 44 mm (1 3/4 in.) hole saw
◦ 4.5 mm (3/16 in.) drill bit

• Marine sealant (recommended)

Installing the Device
Mounting Considerations

NOTICE

This device should be mounted in a location that is not exposed 

to extreme temperatures or conditions. The temperature range 

for this device is listed in the product specifications. Extended 

exposure to temperatures exceeding the specified temperature 

range, in storage or operating conditions, may cause device 

failure. Extreme-temperature-induced damage and related 

consequences are not covered by the warranty.
The mounting surface must be flat to avoid damaging the device 

when it is mounted.

When selecting a mounting location, observe these 

considerations.

• The mounting location should be at or below eye level to 

provide optimal viewing as you operate your vessel.

• The mounting surface must be strong enough to support the 

weight of the device and protect it from excessive vibration or 

shock.

• To avoid interference with a magnetic compass, the device 

should not be installed closer to a compass than the 

compass-safe distance value listed in the product 

specifications.

• The area behind the mounting surface must allow room for 

the routing and connection of the cables.

Mounting the Device
Trim the flush-mount template and ensure it will fit in the 

location where you plan to mount the marine instrument.
The flush-mount template is included in the product box.

Secure the template to the selected mounting location.
Using a 44 mm (1 3/4 in.) hole saw or rotary cutting tool, cut 

the hole in the center of the template.

Drill the 4.5 mm (3/16 in.) mounting holes.
Remove the remainder of the template.
Install the threaded rods 

À

 in the back of the marine 

instrument.

Place the included gasket 

Á

 on the back of the device.

You should apply marine sealant around the gasket to 

prevent leakage behind the dashboard (recommended).

Place the marine instrument into the cutout 

Â

.

Securely fasten the marine instrument from behind the 

mounting surface by tightening the supplied thumb nuts 

Ã

 on 

the threaded rods.

10Connect the NMEA 2000® drop cable and route it to your 

NMEA 2000 backbone.

11Snap the bezel into place.
Connection Considerations
The marine instrument connects to power and to data sources 

through a NMEA 2000 network.
Although the instrument cannot directly receive NMEA® 0183 

data, it can display NMEA 0183 data from sources connected to 

a GNX 20 or GNX 21 device (sold separately) on the same 

NMEA 2000 network.
The instrument can also receive data from Nexus® instruments 

and sensors using a GND™ 10 device (sold separately).
NMEA 2000 Connection Considerations

NOTICE

If you have an existing NMEA 2000 network on your boat, it 

should already be connected to power. Do not connect the 

NMEA 2000 power cable to an existing NMEA 2000 network, 

because only one power source should be connected to a 

NMEA 2000 network.

March 2015

Printed in Taiwan

190-01846-02_0A

0.586684s