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Item

Wire Function

Wire Color

Â

Ground (power and NMEA 0183)

Black

Ã

Power

Red

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.

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 (+)

Updating the Device Software

Before you can update the software, you must obtain a 

software-update memory card or load the latest software onto a 

memory card.

1

Turn on the chartplotter.

2

After the home screen appears, insert the memory card into 

the card slot.

NOTE: 

In order for the software update instructions to 

appear, the device must be fully booted before the card is 

inserted.

3

Follow the on-screen instructions.

4

Wait several minutes while the software update process 

completes.
The device returns to normal operation after the software 

update process is complete.

5

Remove the memory card.

NOTE: 

If the memory card is removed before the device 

restarts fully, the software update is not complete.

Specifications

Device

Specification

Measurement

echoMAP 40 Dimensions (W x H x D) 10.2 x 16.8 x 4.6 cm (4 x 6.6 x 

1.8 in.)

Display size (W x H)

5.4 x 9.5 cm (2.1 x 3.7 in.)

Weight

0.4 kg (0.9 lbs.)

Power input

From 10 to 18 Vdc

Max. power usage

5 W

Compass-safe distance 20 cm (8 in.)

Device

Specification

Measurement

echoMAP 50 Dimensions (W x H x D) 17.3 x 13.5 x 4.4 cm (6.81 x 

5.35 x 1.73 in.)

Display size (W x H)

9 x 9 cm (3.54 x 3.54 in.)

Weight

0.58 kg (1.28 lbs.)

Power input

From 10 to 20 Vdc

Max. power usage

7.1 W

Compass-safe distance 75 cm (29.5 in.)

All Models

Temperature range

From -15 to 55°C (from 5 to 
131°F)

Material

Polycarbonate plastic

Water rating

IEC 60529 IPX7

Transmit power (RMS)** 500 W
Maximum depth***

701 m (2300 ft) at 77 kHz

Frequencies****

• Traditional: 50,77, or 

200 kHz

• DownVü: 260 or 455 kHz.

*The device withstands incidental exposure to water of up to 1 m 

for up to 30 min. For more information, go to 

www.garmin.com

/waterrating

.

**Dependent upon transducer rating and depth.
***Maximum depth, dependent upon transducer, water salinity, 

bottom type, and other water conditions.
****Dependent upon echoMAP model.

NMEA 0183 Information

Type

Sentence

Description

Transmit

GPAPB

APB: Heading or track controller 
(autopilot) sentence "B"

GPBOD

BOD: Bearing (origin to 
destination)

GPBWC

BWC: Bearing and distance to 
waypoint

GPGGA

GGA: Global positioning system 
fix data

GPGLL

GLL: Geographic position 
(latitude and longitude)

GPGSA

GSA: GNSS DOP and active 
satellites

GPGSV

GSV: GNSS satellites in view

GPRMB

RMB: Recommended minimum 
navigation information

GPRMC

RMC: Recommended minimum 
specific GNSS data

GPRTE

RTE: Routes

GPVTG

VTG: Course over ground and 
ground speed

GPWPL

WPL: Waypoint location

GPXTE

XTE: Cross track error

PGRME

E: Estimated error

PGRMM

M: Map datum

PGRMZ

Z: Altitude

SDDBT

DBT: Depth below transducer

SDDPT

DPT: Depth

SDMTW

MTW: Water temperature

SDVHW

VHW: Water speed and heading

Receive

DPT

Depth

DBT

Depth below transducer

MTW

Water temperature

RMC/GGA/GLL

GPS position

VHW

Water speed and heading

WPL

Waypoint location

4

echoMAP 40/50 Series Installation Instructions

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