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VHF 315 SERIES

 

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. Keep the original sales receipt, or a photocopy, in a safe 

place.

1

Go to 

my.garmin.com

.

2

Sign in to your Garmin

®

 account.

Tools Needed

• Pencil
• Drill
• 22 mm (

7

/

8

 in.) drill bit or hole saw

• 3 mm (

1

/

8

 in.) drill bit

• 13 mm (

1

/

2

 in.) drill bit

• 4.76 mm (

3

/

16

 in.) wrench (for mounting the handset 

connector)

• Additional drill bits appropriate for the surface and hardware
• Phillips screwdriver
• Rotary cutting tool or jigsaw (for mounting the active speaker)
• Marine sealant (optional)

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.

• 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 where it will not be exposed to extreme 

temperatures.

• If possible, you should mount the device horizontally, with the 

top of the device facing upward.

• If you must mount the device vertically, you should orient it so 

the connectors do not point upward. This helps avoid 

potential water retention around the connectors.

Antenna Mounting and EME Exposure

 WARNING

Radio operators with cardiac pacemakers, life-support 

machines, or electrical medical equipment should not be 

exposed to excessive radio-frequency (RF) fields, because the 

RF field may interfere with the function of their medical 

equipment.

 CAUTION

This device generates and radiates radio frequency (RF) 

electromagnetic energy (EME). Failure to observe these 

guidelines may expose people to RF radiation absorption 

exceeding the maximum permissible exposure (MPE).

Garmin declares a MPE radius of 2.48 m (97.64 in.) for this 

system, which was determined using 25 W output to an omni-

directional, 6 dBi gain antenna. The antenna should be installed 

to maintain a distance of 2.48 m (97.64 in.) between the antenna 

and all people.

Mounting the Device

NOTICE

If you are mounting the device in fiberglass, when drilling the 

pilot holes, it is recommended to use a countersink bit to drill a 

clearance counterbore through only the top gel-coat layer. This 

will help to avoid cracking in the gel-coat layer when the screws 

are tightened.

Before you mount the device, you must select a mounting 

location and determine the mounting hardware needed for the 

surface.

NOTE: 

Mounting hardware is included with the device, but it 

may not be suitable for the mounting surface.

1

Place the device in the mounting location and mark the 

location of the pilot holes.

2

Using a bit appropriate for the surface and the mounting 

hardware, drill a pilot hole for one corner of the device.

3

Loosely fasten the device to the surface with one corner and 

examine the other three pilot-hole marks.

4

Mark new pilot-hole locations if necessary.

5

Remove the device from the mounting surface.

6

Drill the appropriate pilot holes for the other three marks.

7

Secure the device to the mounting location.

Active Speaker 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 included active speaker is optional, and is not required 

when installing the VHF 315 device. When selecting a mounting 

location for the active speaker, observe these considerations.
• To avoid interference with a magnetic compass, do not install 

the active speaker closer than 50 cm (19.6 in.) to a compass.

• You must install the active speaker inline with a GHS

 11 

handset.

• You must install the active speaker within 1.2 m (48 in.) of the 

location you want to connect the GHS 11 handset.

• You must install the active speaker connected to the primary 

handset (connected to the GHS 11 STATION 1 port) in the 

wheelhouse or an adjacent room, in accordance with FCC 

law.

May 2018

190-02416-02_0A

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