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Power Cable Extension Wire Gauge Table
To find the wire gauge you should use, cross-reference the length of the extension with the voltage of your
power supply.
Up to 4.6 m (15 ft.)
Up to 7 m (23 ft.)
Up to 11 m (36 ft.)
Grounding the Sonar Module
The ground post is located to the right of the power supply connector.
Connect the ground post to the boat water ground circuit.
NOTE: The boat battery ground is an acceptable alternative if your vessel does
not have a designated water ground circuit.
Networking Considerations
This device uses Garmin BlueNet networking technology, and is compatible with both Garmin BlueNet devices
and legacy Garmin Marine Network devices. For more information about Garmin BlueNet technology, including
best practices for constructing a network including both Garmin BlueNet devices and legacy Garmin Marine
Network devices, go to garmin.com/manuals/bluenet.
Before connecting this device to the network, observe the following considerations:
• If your boat is equipped with a Garmin BlueNet chartplotter such as a GPSMAP
should use the included Garmin BlueNet cable to connect the GSD 28 device to an open network port or to a
Garmin BlueNet 20 switch.
• If your boat is equipped with a Garmin BlueNet chartplotter and uses a Garmin BlueNet 30 gateway to
connect legacy Garmin Marine Network devices, you can either connect the GSD 28 device to a Garmin
BlueNet device using the included Garmin BlueNet cable, or you can connect the GSD 28 device to a legacy
Garmin Marine Network device using the included adapter cable. Routing the sonar module through the
legacy side of your marine network does not impact its performance.
• If your boat is equipped with only legacy Garmin Marine Network devices, you must use the included adapter
cable to connect the GSD 28 device to your network.
Manually Configuring a Transducer
Before you can manually configure a transducer, you must connect it to the sonar module using a wiring
method that allows for manual configuration
1 On a chartplotter connected to the same network as the sonar module, from a sonar view, select Options >
Sonar Setup > Installation > Transducers.
2 Select the GSD 28 sonar module.
3 Select Manual Configuration.
4 If more than one transducer is connected to the sonar module, select an option:
• To configure the transducer connected to the terminals labelled LOW, select Low.
• To configure the transducer connected to the terminals labelled HIGH, select High.
5 Select Manual Enabled to turn on manual configuration.
6 Set the parameters for your transducer.
7 Select Done.
6
24 Vdc
2
10 AWG (5.26 mm
)
2
8 AWG (8.37 mm
)
2
6 AWG (13.30 mm
)
(Connecting a Transducer for Manual Configuration,
12 Vdc
2
4 AWG (21.15 mm
)
2
2 AWG (33.63 mm
)
2
0 (1/0) AWG (53.48 mm
®
9000 series chartplotter, you
)
page 4).
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