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Setting the Keel Offset

You can enter a keel offset to compensate the surface reading

for the depth of a keel, making it possible to measure depth

from the bottom of the keel instead of from the transducer

location. Enter a positive number to offset for a keel. You can

enter a negative number to compensate for a large vessel that

may draw several feet of water.

Complete an action, based on the location of the transducer:

• If the transducer is installed at the water line

the distance from the transducer location to the keel of the

boat. Enter this value in steps 3 and 4 as a positive

number.

• If the transducer is installed at the bottom of the keel

measure the distance from the transducer to the water

line. Enter this value in steps 3 and 4 as a negative

number.

Select Settings > My Vessel > Keel Offset.

Select

based on the location of the transducer.

Enter the distance measured in step 1.

Calibrating a Water Speed Device

If you have a speed-sensing transducer connected to the

chartplotter, you can calibrate that speed-sensing device to

improve the accuracy of water-speed data displayed by the

chartplotter.

Select Settings > My Vessel > Calibrate Water Speed.

Follow the on-screen instructions.

If the boat is not moving fast enough or the speed sensor is

not registering a speed, a message appears.

Select OK, and safely increase the boat speed.

If the message appears again, stop the boat, and ensure the

speed-sensor wheel is not stuck.

If the wheel turns freely, check the cable connections.

If you continue to get the message, contact Garmin product

support.

Setting the Water Temperature Offset

Before you can set the water temperature offset, you must have

a NMEA 0183 water-temperature sensor or a temperature-

capable transducer to measure water temperature.

The temperature offset compensates for the temperature

reading from a temperature sensor.

Measure the water temperature using the temperature

sensor or temperature-capable transducer that is connected

to the chartplotter.

Measure the water temperature using a different temperature

sensor or a thermometer that is known to be accurate.

Device Configuration

Subtract the water temperature measured in step 1 from the

water temperature measured in step 2.

This is the temperature offset. Enter this value in step 5 as a

positive number if the sensor connected to the chartplotter

measures the water temperature as being colder than it

actually is. Enter this value in step 5 as a negative number if

the sensor connected to the chartplotter measures the water

temperature as being warmer than it actually is.

Select Settings > My Vessel > Temp. Offset.

, measure

Enter the temperature offset calculated in step 3.

Communications Settings

NOTE: Some settings and options require additional charts or

hardware.

Select Settings > Communications.

Serial Port 1: Sets the input/output format for port 1 to use

when connecting the chartplotter to external NMEA devices,

computers, or other Garmin devices.

Serial Port 2: Sets the input/output format for port 2 to use

when connecting the chartplotter to external NMEA devices,

computers, or other Garmin devices.

NMEA 0183 Setup: Sets the NMEA 0183 sentences the

chartplotter transmits, how many digits to the right of the

decimal point are transmitted in a NMEA output, and how

waypoints are identified

NMEA 2000 Setup: Allows you to view and label the devices on

the NMEA 2000 network

Marine Network: Allows you to view the devices with which you

are sharing maps, sonar, or radar. Not available on all

chartplotter models.

NOTE: You can only view networked data on a model that

supports that data. For example, you cannot view networked

radar on model that does not support radar.

Wireless Devices: Allows you set up wireless devices

(Communication with Wireless

chartplotter models.

Wi-Fi® Network: Allows you set up the Wi‑Fi network

(Communication with Wireless

NMEA 0183

The chartplotters support the NMEA 0183 standard, which is

used to connect various NMEA 0183 devices, such as VHF

radios, NMEA instruments, autopilots, wind sensors, and

heading sensors.

To connect the chartplotter to optional NMEA 0183 devices, see

the chartplotter installation instructions.

The approved NMEA 0183 sentences for the chartplotter are

GPAPB, GPBOD, GPBWC, GPGGA, GPGLL, GPGSA,

GPGSV, GPRMB, GPRMC, GPRTE, GPVTG, GPWPL,

GPXTE, and Garmin proprietary sentences PGRME, PGRMM,

and PGRMZ.

This chartplotter also includes support for the WPL sentence,

DSC, and sonar NMEA 0183 input with support for the DPT

(depth) or DBT, MTW (water temperature), and VHW (water

temperature, speed, and heading) sentences.

NMEA 0183 Settings

Select Settings > Communications > NMEA 0183 Setup.

Sounder: Enables NMEA 0183 output sentences for the

sounder (if applicable).

Route: Enables NMEA 0183 output sentences for routes.

System: Enables NMEA 0183 output sentences for system

information.

Garmin: Enables NMEA 0183 output sentences for Garmin

proprietary sentences.

(NMEA 0183

Settings).

(NMEA 2000

Settings).

Devices). Not available on all

Devices).