Measurement Range - Furuno DS-30 Operator's Manual

13. SPECIFICATIONS OF

1. Measurement Range

a. Ship's Speed
b. Speed Measurement Depth
c. Current
d. Current Measurement Depth
2. Accuracy
a. Ship's Speed
~
b. Sea Depth (clearance) :
c. Distance Signal
d. Current Speed
NOTE 1: The speed error which results from variation of sound velocity by water temperature is
automatically compensated by water temperature measured with temperature sensor mounted on the
transducer: The salinity does not affect accuracy.
NOTE 2: Ship's static inclination (trim and heel) degrades accuracy by 100(cosθ-1)%
(where θ = angle of inclination). The error caused by this inclination can be corrected by entering trim
and heel angles (-12.5° to + 12.5°) on the OFFSET DATA menu.
NOTE 3: Ship 's rolling/pitching degrades accuracy by 0.2% for ±5° rolling/pitching and 0.65% for ±10°.
The error is 1% when it is 11.5%.
DOPPLER SONAR DS-30
Bow:
Fore-aft: -10.00 to + 40.00 knots
Port-stbd: -9.99 to + 9.99 knots
Stern with optional Laser gyro:
Port-stbd: -9.99 to + 9.99 knots
Ground tracking:1 to 200m below hull bottom
Water tracking: 3 to 25m below hull bottom
(Above figures will changed depending on installation conditions
and surrounding water conditions. The measuring accuracy will
be reduced for the depth shallower than 30 m.)
Direction: 360 degrees (Relative or True with gyro signal input)
Speed: 0.0 to + 9.9 knots
2 to 100m below hull bottom (clearance of more than 8m required)
±0.2% or ±0.01 m/sec for low ship's speed ground tracking.
±1.0% or ±0.1 knots for water tracking mode and high ship's
speed ground tracking (clearance of more than 30m).
±1.0% or ±0.04 m/sec for port-stbd at stern (ship's length 400 m).
[Influence of ship 's inclination and vibration excepted.]
±1.0% or ±0.1m
(at 1500 m/sec of sound velocity and by converting inclined
beams to vertical, without consideration of temperature error.)
±1.0% or ±0.1 nm
±2.0% or ±0.2 kt
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