Garmin echoMAP 72sv Installation Instructions | Page 2

Garmin Chartplotter/Sonar Combos Installation Instructions - echoMAP 72sv.
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A flush-mount template and hardware can be used to mount the 

device in your dashboard.
Trim the template and make sure it fits in the location where 

you want to mount the device.

Secure the template to the selected mounting location.
Using a 9.5 mm (3/8 in.) drill bit, drill one or more of the holes 

inside the corners of the solid line on the template to prepare 

the mounting surface for cutting.

Using a jigsaw or rotary cutting tool, cut the mounting surface 

along the inside of the solid line indicated on the template.

Place the device into the cutout to test the fit.
If necessary, use a file and sandpaper to refine the size of 

the hole.

7 NOTE: Not all devices have trim caps.

Using a pry tool such as a flat piece of plastic or a 

screwdriver, carefully pry up the corners of the trim caps 

À 

and slide the pry tool to the center 

Á

 to remove the trim caps.

Ensure the mounting holes on the device line up with the pilot 

holes on the template.

If the mounting holes on the device do not line up, mark the 

new pilot-hole locations.

10Using a 3.2 mm (1/8 in.) drill bit, drill the pilot holes.
11Remove the template from the mounting surface.
12If you will not have access to the back of the device after you 

mount it, connect all necessary cables to the device before 

placing it into the cutout.
NOTE: To prevent corrosion of the metal contacts, cover 

unused connectors with weather caps.

13Install the rubber gasket pieces on the back of the device.

The pieces of the rubber gasket have adhesive on the back. 

Make sure you remove the protective liner before installing 

them on the device.

14Place the device into the cradle.
15Securely connect each cable to a port on the cradle.
16Place the locking bracket over the cables.
17Place the device into the cutout.

18Secure the device to the mounting surface using the included 

screws.

19Install the trim caps by snapping them in place around the 

edges of the device.

Wiring Harness
• The wiring harness connects the device to power and NMEA® 

0183 devices.

• The device has one internal NMEA 0183 port that is used to 

connect to NMEA 0183 compliant devices.

• If it is necessary to extend the power and ground wires, you 

must use .82 mm2 (18 AWG) or larger wire.

• If it is necessary to extend the NMEA 0183 or alarm wires, 

you must use 22 AWG (.33 mm2) wire.

Item

Wire Function

Wire Color

À

NMEA 0183 internal port Rx (in)

Brown

Á

NMEA 0183 internal port Tx (out)

Blue

Â

Ground (power and NMEA 0183)

Black

Ã

Power

Red

Connecting the Wiring Harness to Power
Route the wiring harness to the power source and to the 

device.

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

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

NMEA 0183 Connection Considerations
• The installation instructions provided with your NMEA 0183 

compatible device should contain the information you need to 

identify the transmitting (Tx) and receiving (Rx) A (+) and B 

(-) wires.

NMEA 0183 Connection Diagram

+

-

Item

Description

À

12 Vdc power source

Á

Wiring harness

Â

NMEA 0183-compliant device

Item Garmin Wire 

Function

Garmin Wire 
Color

NMEA 0183 Device Wire 
Function

Ê

Power

Red

Power

Ë

Ground

Black

Data ground

Ì

Tx

Blue

Rx/A (+)

Í

Rx

Brown

Tx/A (+)

Installing the Cables and Connectors
Wiring to Power
Route the power cable from the swivel mount to the boat 

battery or fuse block.

If necessary, extend the wires using .82 mm2 (18 AWG) or 

larger wire.

Connect the red wire to the positive terminal on the battery or 

fuse block, and connect the black wire to the negative 

terminal.

2

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