3.4 Range measurement
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.64(67) - Adoption of New and Amended Performance Standards - (Adopted on 4 December 1996) - Annex 4 - Recommendation on Performance Standards for Radar Equipment. LR Note: See also MSC.192(79) - 3 Radar - 3.4 Range measurement

3.4 Range measurement

  3.4.1 Electronic listed range rings should be provided for range measurements as follows:

  • .1 on the range scale 0.25, 0.5, 0.75 nautical miles at least two and not more than six range rings should be provided, on each of the other mandatory range scales six range rings should be provided; and

  • .2 where off-centred facilities have been provided, additional range rings should be provided at the same range intervals.

  3.4.2 An electronic variable range marker in the form of a ring should be provided with a numeric readout of range. This readout should not display any other data. For ranges of less than 1 nautical mile, there should be only one zero before the decimal point. Additional variable range markers may be provided.

  3.4.3 The fixed range rings and the variable range markers should enable the range of an object to be measured with an error not exceeding 1% of the maximum range of the scale in use, or 30 m, whichever is the greater.

  3.4.4 The accuracy should be maintained when the display is off-centred.

  3.4.5 The thickness of the fixed range rings should not be greater than the maximum permissible thickness of the heading line.

  3.4.6 On all range scales. it should be possible to set the variable range marker with the required precision within 5 s in all cases. A range that is set by the user should not change automatically when the range scale is changed.

Parent topic: 3 Radar
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