JRC JLN-550 Instruction Manual page 26

Doppler sonar
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Vessel Speed Unit
Operating Mode
AUTO: Ground speed(BT) or water speed(WT) automatic switching
BT:
WT:
GPS:
16
4. Operation
UNIT
MODE
Operating mode
AUTO → BT → WT → GPS
Forced ground speed(BT: Bottom Tracking)
Forced water speed(WT: Water Tracking)
Fore/Aft. Port/Stb. Speed based upon data from the GPS
navigator is displayed.
In AUTO mode, Ground speed (BT) read preferentially..
Speed measurement depth is as follows:
Ground tracking (BT): 2m to 250m below hull bottom.
Water tracking (WT): Aprox. 3m below hull bottom.
(Above figures will changed depending on installation conditions and
surrounding water conditions and the hardness of bottom.)
1)
Press UNIT switch to turn alternately [kts] or [m/s]
for the vessel speed unit.
1 [m/s] = (1852m ÷ 3600Sec)×1 [kts]
1)
Press MODE switch to change operating mode.
2)
Each time you press MODE , the unit can be setting
in fore operating mode.

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