Setting The Keel Offset - Garmin echoMAP CHIRP 40 Owner's Manual

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.
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 > Temp. 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.
30
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.
5
If the wheel turns freely, check the cable connections.
6 If you continue to get the message, contact Garmin product
, measure
support.
Setting the Fuel Capacity of the Vessel
1
Select Settings > My Vessel > Fuel Capacity.
,
2 Enter the combined total capacity of the fuel tanks.
Synchronizing the Fuel Data with the Actual Vessel
Fuel
You can synchronize the fuel levels in the chartplotter with the
actual fuel in the vessel when you add fuel to your vessel.
1
Select Gauges > Engine > MENU.
2
Select an option:
• After you have filled up all the fuel tanks on the vessel,
select Fill Up All Tanks. The fuel level is reset to
maximum capacity.
• After you have added less than a full tank of fuel, select
Add Fuel to Boat, and enter the amount added.
• To specify the total fuel in the vessel tanks, select Set
Total Fuel Onboard, and enter the total amount of fuel in
the tanks.
Customizing Engine Gauge and Fuel Gauge Limits
You can configure the upper and lower limits and the range of
desired standard operation of a gauge. When a value exceeds
the range of standard operation, the gauge becomes red.
NOTE: Not all options are available for all gauges.
1 Select a gauge.
2
Select Gauge Limits > Custom > Edit Limits.
3 Select an option:
• To set the minimum value of the standard operating
range, select Rated Min..
• To set the maximum value of the standard operating
range, select Rated Max..
• To set the lower limit of the gauge lower than the rated
minimum, select Scale Min..
• To set the upper limit of the gauge higher than the rated
maximum, select Scale Max..
4
Select the limit value.
5
Repeat steps 4 and 5 to set additional gauge limits.
Communications Settings
NOTE: Some settings and options require additional charts or
hardware.
Select Settings > Communications.
Serial Port 1: Sets the input/output format for the serial port 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.
(NMEA 0183 Settings, page
(NMEA 2000 Settings, page
Device Configuration
31).
31).