Garmin BLUENET 20 Installation Instructions Manual Download Page 2

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 (

Specifications, page 5

). 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.

• You must mount the device in a location where it will not be submerged.
• You must mount the device in a location with adequate ventilation so it does not trap heat.
• You must mount the device at least 2.54 cm (1 in.) from cables and other potential sources of interference.
• You must mount the device in a location that allows room for the routing and connection of all cables.
• If needed, you can install this device on an optional mounting bracket that holds a Garmin BlueNet 30 

gateway and a Garmin BlueNet 20 switch. Contact your local Garmin dealer or go to 

buy.garmin.com

 to 

purchase this bracket.

Connection Considerations

Device and Port Overview

Item Description

Notes

Power button

Power cable port

You must connect this device to a 12 to 24 Vdc power source using the 
included cable

Garmin Garmin 
BlueNet cable ports

You can connect a Garmin BlueNet device to any of these ports.
NOTE: This device is compatible with only Garmin BlueNet devices. If you have 
one or more legacy Garmin Marine Network devices, you must also install a 
Garmin BlueNet 30 gateway (sold separately) so the devices can communicate 
properly.

Optional grounding 
location

If necessary, you can connect the device to the water ground of the boat to help 
avoid interference (

Additional Grounding Consideration, page 3

).

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