Furuno DS-85 Operator's Manual page 7

Conditions affecting accuracy
(with ref to IMO A.824/3.3)
The Doppler speed log DS-85 is designed for reliable and accurate performance through FURU-
NO's long experience and advanced technology. It operates on the best choice of system frequen-
cy and power output. As far as the sonic energy is used, the performance (accuracy) may be
reduced or even lost in the following conditions:
• rough weather (may be sea state 6 or higher severity).
• improper location of sensor; for example, too close to the propeller, thrusters, drain tubes or echo
sounder's transducer.
• depth under the keel if less than 3 m.
• Pitch and roll is ±10% or more.
Take care to the transducer location
The transducer may be damaged if it hits the dry dock blocks. Take the following measures to pre-
vent damage to the transducer when the ship is put in drydock.
1. Before delivering the ship, draw up a suitable docking plan taking into account the dimensions
and location of the transducer. Store the plans aboard the ship.
2. Place the dry dock blocks according to the plan.
3. Have a diver check the position between the transducer and the blocks before removing the
water. Confirm that the transducer will not touch the blocks.
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REMARKS ON USAGE