Configuring My Boat - Garmin GPSMAP 420 Owner's Manual

Configuring the Chartplotter

Configuring My Boat

To configure settings for your boat, from the Home screen, select
Configure > My Boat.
Keel Offset—offset 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. Enter a negative number to compensate for a large
vessel that may draw several feet of water.
To adjust the Keel Offset:
1. From the Home screen, select
Offset.
2. Use the Rocker to enter the measured distance from the
transducer location to the water line or to the keel of the boat.
• If you are measuring down to the keel (transducer installed at
the water line), enter a (+) positive number. This shows the
depth at the bottom of the keel.
• If you are measuring up to the water line (transducer installed
on the bottom of the keel), enter a (-) negative number. This
shows the depth at the surface.
3. Select Done to accept the number.
4
Configure > My Boat > Keel
Transducer at Surface
A (+) positive number
shows depth at the bottom
of the keel.
Transducer at the
Bottom of the Keel
A (-) negative number
shows depth at the
surface.
Temp Offset—set the temperature offset for the temperature sensor
of your transducer.
Calibrate water Speed—use this menu to calibrate a speed-sensing
device. Follow the on-screen directions for calibration. If you do not
have a speed-sensing device, this menu does not appear.
NOTE: If the boat is not moving fast enough or the speed sensor is
not registering a speed, a "Speed Too Low" message appears. Select
OK, and safely increase the speed of the boat. If you get the message
again, stop the boat and make sure 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.
fuel Capacity—enter the total fuel capacity of your boat.
GPSMAP 400/500 Series Owner's Manual