Selecting Speed Tracking Mode; Selecting Unit Of Speed Measurement; Displaying Distance Run Or Keel Clearance - Furuno DS-50 Operator's Manual

Selecting Speed Tracking Mode

Press the [MODE] selector to select speed tracking mode among water, ground or automatic. Select
the mode considering depth and speed. "G", "W" or "A" lights to show mode selected.
G:Measures and displays a speed relative to ground. The depth range usable for this mode is 1to 200
meters below the keel.
W:Measures and displays a speed relative to the water mass. The depth from the keel to the seabed
should be three meters or more.
Note: It is recommended to use the water tracking mode in operation with an ARPA for collision
avoidance task.
A:Automatically selects ground tracking mode or water tracking speed mode depending on depth.
Water tracking mode is selected when the keel clearance exceeds 200 meters.
Note: Actual working depth in the ground tracking mode depends on seabed and water conditions,
and the reflecting properties for sonic pulses.

Selecting Unit of Speed Measurement

Speed can be measured in knots or meters/second. Press the [kn/ m/s] selector to select the unit.
"kn" or "m/s" lights to show the selection.

Displaying Distance Run or Keel Clearance

Press the [Distance/Keel Clearance] selector to display distance run or keel clearance (depth) .
Distance run is always displayed in nautical miles. Keel clearance is the depth from the transducer to
the seabed, and can be displayed in meters, feet or fathoms. See page 11 for how to select unit of keel
clearance measurement.
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