Garmin 521 User Manual

Configuring the Chartplotter

  To configure settings for your boat, from the Home screen, select 

 >

.

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.

1.  From the Home screen, select 

 > 

 > 

.

2.  Use the 

 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 

 to accept the number.

•

•

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 

, 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.