Lowrance HDS-9 LIVE HDS Live Installation Manual - Page 39

Water speed calibration, Water speed averaging, Water temperature calibration

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• To show the depth from the lowest point of the vessel to the bottom, set the offset equal to the vertical distance between the transducer and the lowest part of the vessel, A (negative value). • To show the depth from the water surface to the bottom, set the offset equal to the vertical distance between the transducer and the water surface, B (positive value) • 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 %. Water speed averaging Averages water speed by measuring your speed at a selected interval of time. Water speed intervals range from one to thirty seconds. For example if you select five seconds, your displayed water speed will be based on averaging over 5 seconds of sampling. Calibration range: 1-30 seconds. Default is 1 second. Water temperature calibration Temperature calibration is used to adjust the water temperature value from the sonar transducer. It may be required to correct for localized influences to the measured temperature. Calibration range: -9.9° - +9.9°. Default is 0°. Ú Note: Water temperature calibration only appears if the transducer is temperature capable. Software setup | HDS Live Installation Manual 39

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•
To show the depth from the lowest point of the vessel to the
bottom, set the offset equal to the vertical distance between the
transducer and the lowest part of the vessel,
A
(negative value).
•
To show the depth from the water surface to the bottom, set the
offset equal to the vertical distance between the transducer and
the water surface,
B
(positive value)
•
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 %.
Water speed averaging
Averages water speed by measuring your speed at a selected
interval of time. Water speed intervals range from one to thirty
seconds. For example if you select five seconds, your displayed
water speed will be based on averaging over 5 seconds of sampling.
Calibration range: 1-30 seconds. Default is 1 second.
Water temperature calibration
Temperature calibration is used to adjust the water temperature
value from the sonar transducer. It may be required to correct for
localized influences to the measured temperature.
Calibration range: -9.9° - +9.9°. Default is 0°.
Ú
Note:
Water temperature calibration only appears if the
transducer is temperature capable.
Software setup
| HDS Live Installation Manual
39