background image

included screws are not appropriate for the mounting surface, 

you must purchase suitable hardware.

Installing the Handset Cradle

You should install the handset connector in the mounting 

surface before installing the handset cradle (

Installing the 

Handset Connector in the Mounting Surface

, page 2

).

1

Select a mounting location for the handset cradle near the 

handset connector.

TIP: 

To help determine the best location, you can place the 

handset in the cradle, connect the handset to the connector, 

and hold it against the mounting surface.

2

Using the cradle as a template, mark the screw locations.

3

Set the cradle aside.
Do not drill through the cradle.

4

Using a 3 mm (

1

/

8

 in.) drill bit, drill the pilot holes.

5

Using the included M3.5 screws, secure the cradle to the 

mounting surface.

Connection Considerations

You must connect the VHF 315 radio to power, to a GHS 11 

handset, a VHF antenna, and a GPS source. When making 

connections to the device, observe the following considerations.
• You must connect the primary handset (installed in the 

wheelhouse or adjacent room, in accordance with FCC law) 

to the GHS 11 STATION 1 port.

• You can connect up to three handsets to the radio. You can 

purchase additional handsets from your Garmin dealer.

• You can install the included active speaker (optional) in-line 

with any handset connected to the radio. You can purchase 

additional active speakers from your Garmin dealer.

• You can connect the radio to a GPS source through the 

NMEA 2000

®

 network or through an external GPS antenna 

(not included).

Connecting the Wiring Harness to Power

1

Route the wiring harness to the power source and to the 

device.

2

Connect the red wire to the positive (+) battery terminal, and 

connect the black wire to the negative (-) battery terminal.

Additional Grounding Considerations

This device should not need any additional chassis grounding in 

most installation situations. If interference is experienced, the 

grounding screw on the housing can be used to connect the 

device to the water ground of the boat to help avoid the 

interference.

Connecting a VHF Antenna

1

Mount the VHF antenna (sold separately) according to the 

installation instructions provided with the antenna.

2

Connect the VHF antenna to the ANT port on the back of the 

device.

Connecting the Active Speaker to the VHF Radio and 

Handset

Before you connect the active speaker to the VHF radio and 

handset, you should mount the active speaker (

Active Speaker 

Mounting Considerations

, page 1

).

1

Route the female end of the included extension cable from 

the speaker mounting location to the VHF radio.

2

Connect the extension cable to the GHS 11 STATION 1 port 

on the VHF radio.

3

Connect the male end of the extension cable to the short 

cable from the active speaker.

4

Route the long cable from the active speaker to the handset 

connector mounting location.

5

If necessary, install the cable from the active speaker in the 

mounting surface (

Installing the Handset Connector in the 

Mounting Surface

, page 2

).

6

Connect the handset to the long cable from the active 

speaker.

Connecting the Handset to the VHF Radio Using an 

Extension Cable

If you install an active speaker with the handset, the handset 

connects to the radio through the active speaker (

Connecting 

the Active Speaker to the VHF Radio and Handset

, page 3

).

1

Route the female end of the included extension cable from 

the handset mounting location to the VHF radio.

2

Connect the extension cable to the GHS 11 STATION 1 port 

on the VHF radio.

3

If necessary, install the handset connector on the extension 

cable in the mounting surface (

Installing the Handset 

Connector in the Mounting Surface

, page 2

).

4

Connect the handset to the extension cable.

NMEA 2000 Device Connections

NOTICE

If you are connecting this device to an existing NMEA 2000 

network, the NMEA 2000 network 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.
If you are connecting this device to an existing NMEA 2000 

network or engine network by another manufacturer, you should 

install a NMEA 2000 Power Isolator (010-11580-00) between 

the existing network and the Garmin devices.
If you are installing a NMEA 2000 power cable, you must 

connect it to the boat ignition switch or through another in-line 

switch. NMEA 2000 devices will drain your battery if the NMEA 

2000 power cable is connected to the battery directly.

To connect this device to your existing NMEA 2000 network, you 

must purchase a NMEA 2000 cable and connector.
If you are unfamiliar with NMEA 2000, you should read the 

“NMEA 2000 Network Fundamentals” chapter of the 

Technical 

Reference for NMEA 2000 Products

. Go to 

www.garmin.com

/manuals/VHF315/

.

Item

Description

À

Compatible NMEA 2000 chartplotter or other device

Á

VHF 315 device

Â

Ignition or in-line switch

Ã

NMEA 2000 power cable

Ä

NMEA 2000 drop cable

Å

12 Vdc power source

Æ

NMEA 2000 terminator or backbone cable

3

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