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GPSMAP 4000 Series Owner’s Manual 39
confIGurInG the unIt
confIGurInG
the unIt
Keel Offset—offset the surface reading for the depth of a keel. This makes it possible to measure
depth from the bottom of your keel instead of from the transducer’s 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.
To adjust the Keel Offset:
1. From the Home screen, select Congure > My Boat > Keel Offset.
2. Use the select screen keyboard to specify the offset.
3. Select Done to accept the number.
NOTE: Select Cancel to cancel your changes and return to the My Boat screen.
Enter a (+) positive number
to show depth from the
bottom of the keel.
Transducer at Surface
Enter a (-) negative
number to show depth
from the surface.
Transducer at Bottom
of Keel
Keel Offset
Transducer—select the transducer type, set the temperature source, sonar cone angles, and calibrate
water speed.
Type—set the transducer type (Dual Frequency or Dual Beam).
Temperature Source—set the temperature source (Transducer or NMEA).
Sonar Cone Angles—when using a transducer other than the standard Garmin transducer, you
can set the angle, in degrees, of the sonar cone so that it is accurately depicted on the Fish Eye
3D screen. Select either 200kHz or 50kHz and use the on-screen keyboard to enter the angle.
NOTE: The Sonar Cone Angles setting is preset to match the cone angle of a standard Garmin dual
frequency transducer. This option should only be used to match the specications of a non-standard
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 boat speed. 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.
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