Setting Alarms; My Vessel Settings; Garmin Marine Network; Navigation Alarms - Garmin GPSMAP 7400 Series Owner's Manual

Garmin Marine Network

The Garmin Marine Network allows you to share data from
Garmin peripheral devices with the chartplotters quickly and
easily. You can connect a chartplotter to a Garmin Marine
Network to receive data from and share data with other Garmin
Marine Network-compatible devices and chartplotters.

Setting Alarms

Navigation Alarms

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.

System Alarms

Alarm Clock: Sets an alarm clock.
Unit 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.
Setting the Fuel Alarm
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.
1
Select Settings > Alarms > Fuel > Fuel Level Alarm > On.
2 Enter the remaining amount of fuel that triggers the alarm.

Setting Weather Alarms

Before you can set weather alarms, you must have a compatible
chartplotter connected to a weather device, such as a GXM
device, and have a valid weather subscription.
1 Select Settings > Alarms > Weather.
2
Turn on alarms for specific weather events.

My Vessel Settings

NOTE: Some settings and options require additional charts or
hardware.
Select Settings > My Vessel.
Keel Offset: Offsets 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
Offset).
Temperature Offset: Compensates for the water temperature
reading from a NMEA 0183 water-temperature sensor or a
temperature-capable transducer
Temperature Offset).
Calibrate Water Speed: Calibrates the speed-sensing
transducer or sensor (Calibrating a Water Speed
Fuel Capacity: Sets the combined fuel capacity of all the fuel
tanks on your vessel (Setting the Fuel Capacity of the
Vessel).
Vessel Type: Enables some chartplotter features based on the
boat type.
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.
38
(Setting the Keel
(Setting the Water
Device).
1
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.
2
Select Settings > My Vessel > Keel Offset.
3
Select or based on the location of the transducer.
4
Enter the distance measured in step 1.
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.
1
Measure the water temperature using the temperature sensor
or temperature-capable transducer that is connected to the
chartplotter.
2
Measure the water temperature using a different temperature
sensor or a thermometer that is known to be accurate.
3
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.
4
Select Settings > My Vessel > Temperature Offset.
5 Enter the temperature offset calculated in step 3.
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.
1 Select Settings > My Vessel > Calibrate Water Speed.
2
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.
3
Select OK, and safely increase the boat speed.
4
If the message appears again, stop the boat, and ensure the
speed-sensor wheel is not stuck.
, measure
,
Device Configuration