Garmin echoMAP CHIRP 74cv Owner's Manual

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.

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.

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.

Posn Precision: Adjusts the number of digits to the right of the 

decimal point for transmission of NMEA output.

Waypoint IDs: Sets the device to transmit waypoint names or 

numbers via NMEA 0183 while navigating. Using numbers 

may resolve compatibility issues with older NMEA 0183 

autopilots.

Diagnostics: Displays NMEA 0183 diagnostic information.
Defaults: Restores the NMEA 0183 settings to the original 

factory defaults.

Select Settings > Communications > NMEA 2000 Setup.
Device List: Displays the devices connected to the network.
Label Devices: Changes the labels for available connected 

devices.

You can name devices and sensors connected to the Garmin 

Marine Network and the NMEA 2000 network.

Select Settings > Communications.

Select Marine Network or NMEA 2000 Setup > Device List.

Select a device from the list on the left.

Select Change Name.

Enter the name, and select Done.

Select Settings > Alarms > Navigation.
Arrival: Sets an alarm to sound when you are within a specified 

distance or time from a turn or a destination.

Anchor Drag: Sets an alarm to sound when you exceed a 

specified drift distance while anchored.

Off Course: Sets an alarm to sound when you are off course by 

a specified distance.

Alarm Clock: Sets an alarm clock.

Device Voltage: Sets an alarm to sound when the battery 

reaches a specified low voltage.

GPS Accuracy: Sets an alarm to sound when the GPS location 

accuracy falls outside the user-defined value.

Before you can set a fuel level alarm, a compatible fuel flow 

sensor must be connected to the NMEA 2000 network.
You can set an alarm to sound when the total amount of 

remaining onboard fuel reaches the level you specify.

Select Settings > Alarms > Fuel > Fuel Alarm > On.

Enter the remaining amount of fuel that triggers the alarm.

Select Settings > Units.
System Units: Sets the unit format for the device.
Variance: Sets the magnetic declination, the angle between 

magnetic north and true north, for your present location.

North Reference: Sets the direction references used in 

calculating heading information. True sets geographic north 

as the north reference. Grid sets grid north as the north 

reference (000º). Magnetic sets the magnetic north as the 

north reference.

Position Format: Sets the position format in which a given 

location reading appears. Do not change this setting unless 

you are using a map or chart that specifies a different 

position format.

Map Datum: Sets the coordinate system on which the map is 

structured. Do not change this setting unless you are using a 

map or chart that specifies a different map datum.

Pressure Reference Time: Sets the reference time used to 

calculate the barometer trend. The trend is indicated in the 

barometer field.

Time Format: Sets a 12-hour, 24-hour, or UTC time format.
Time Zone: Sets the time zone, or allows automatic selection 

based on GPS location.

NOTE: Some settings and options require additional charts or 

hardware.
Select Settings > Navigation.
Route Labels: Sets the type of labels shown with route turns on 

the map.

Auto Guidance: Sets the parameters the chartplotter uses 

when calculating an Auto Guidance path, when you are using 

some premium maps.

Turn Transition Activ.: Sets the turn transition to be calculated 

based on time or distance.

Turn Transition Time: Sets how many minutes before the turn 

that you transition to it as the next leg, when Time is selected 

for the Turn Transition Activ. setting. You can raise this value 

to help improve the accuracy of the autopilot when navigating 

a route or an Auto Guidance path with many frequent turns or 

at higher speeds. For straighter routes or slower speeds, 

lowering this value can improve autopilot accuracy.

Turn Transition Dist.: Sets how far before the turn that you 

transition to it as the next leg, when Distance is selected for 

the Turn Transition Activ. setting. You can raise this value to 

help improve the accuracy of the autopilot when navigating a 

route or an Auto Guidance path with many frequent turns or 

at higher speeds. For straighter routes or slower speeds, 

lowering this value can improve autopilot accuracy.

Route Start: Selects a starting point for route navigation.

Device Configuration

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