Lowrance HDS Carbon Installation Manual page 42

42
A
Lowest point of vessel offset: Set the distance from the
transducer to the lowest point of the boat in the water - this
should be set as a negative value. For example, - 0.3 m (-1 ft).
B
Depth below surface (waterline) offset: Set the distance from
the transducer to the surface - this should be set as a
positive value. For example, +0.5 m (+1.77 ft).
For depth below transducer, set the offset to 0.
Water speed calibration
Water speed calibration is used to adjust the speed value from the
paddle wheel to match the actual boat speed through the water.
Actual speed can be determined from GPS speed over ground
(SOG) or by timing the boat over a known distance. Water speed
calibration should be performed in calm conditions, with minimal
wind and current movement.
Increase this value above 100 % if the paddle wheel is under
reading, and decrease this value if it is over reading. For example, if
the average water speed reads 8.5 knots (9.8 MPH) and SOG records
10 knots (11.5 MPH) the calibration value needs to be increased to
117 %. To calculate the adjustment, divide the SOG by the
paddlewheel speed, and multiply the product by 100.
Calibration range: 50-200 %. Default is 100 %.
Software Setup | HDS Carbon Installation Manual
B
A