Water Speed Calibration - Lowrance HDS-5x Operation Manual

Before setting keel offset, measure the distance from the transducer to the lowest
part of the keel. If, for example, the keel is 3.5 feet below the transducer, it will be
input as –3.5 feet.
NOTE: To input a keel offset that accounts for the distance
from the transducer to the water surface, you will enter a posi-
tive number. If the transducer is 1.5 feet below the waterline,
it will be input as +1.5 feet. That will give you a more precise
To set Keel Offset:
1. Highlight the Keel Offset text box on the Installation menu and press
enTeR.
2. Use the keypad to enter the desired keel offset. Select OK and press
enTeR.

Water Speed Calibration

When there are differences in speed data, Water Speed
Calibration calibrates data from a paddlewheel with GPS
data. That ensures the accuracy of speed data from your
paddlewheel.
To calibrate Water Speed:
1. Select the Water Speed Calibration text box from the Installation
menu and press enTeR. The Water Speed Calibration keypad will
appear.
2. Use the arrow keys to enter the percentage difference in speed
data. Select OK and press enTeR.
NOTE: If the paddlewheel is reading a slower speed than the
GPS unit, you will input a positive (+) percentage. Conversely,
a negative (–) percentage will be entered if the paddlewheel is
depth reading.
reading a faster speed than the GPS unit.
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Settings
Water speed
calibration dialog box