3 ACCURACY OF MEASUREMENT
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Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.96(72) – Adoption of Amendments to Performance Standards for Devices to Measure and Indicate Speed and Distance (Resolution A.824(19)) – (Adopted on 22 May 2000) - Annex – Amendments to Resolution A.824(19) on Performance Standards for Devices to Indicate Speed and Distance - Annex – Recommendation on Performance Standards for Devices to Measure and Indicate Speed and Distance - 3 ACCURACY OF MEASUREMENT

3 ACCURACY OF MEASUREMENT

  3.1 Errors in the measured and indicated speed, when the ship is operating free from shallow water effect and from the effects of wind, sea bottom type, current and tide, should not exceed the following:

  • .1 for a digital display - 2% of the speed of the ship, or 0.2 knots, whichever is greater;

  • .2 for an analogue display – 2.5% of the speed of the ship, or 0.25 knots, whichever is greater; and

  • .3 for output data transmission – 2% of the speed of the ship, or 0.2 knots, whichever is greater.

  3.2 Errors in the indicated distance run, when the ship is operating free from shallow water effect and from the effects of wind, sea bottom type, current and tide, should not exceed 2% of the distance run by the ship in 1 h or 0.2 nautical miles in each hour, whichever is greater.

  3.3 If the accuracy of devices to indicate speed and distance run can be affected in use by certain conditions (e.g. sea state and its effects, water temperature, salinity, sound velocity in water, depth of water under the keel, heel and trim of ship), details of possible effects should be included in the equipment handbook.

Parent topic: Annex – Recommendation on Performance Standards for Devices to Measure and Indicate Speed and Distance
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