What are IMO Performance Standard for RADAR?

  • Means should be available to ensure that the radar system is operating at the best performance. Where applicable to the radar technology, manual tuning should be provided and additionally, automatic tuning may be provided. 
  • An indication should be provided, in the absence of targets, to ensure that the system is operating at the optimum performance.
  • Means should be available (automatically or by manual operation) and while the equipment is operational, to determine a significant drop in system performance relative to a calibrated standard established at the time of installation.


The radar equipment should be fully operational (RUN status) within 4 minutes after switch ON from cold.  A STANDBY condition should be provided, in which there is no operational radar transmission.  The radar should be fully operational within 5 sec from the standby condition.


  • Range scales of 0.25, 0.5, 0.75, 1.5, 3, 6, 12 and 24 NM should be provided. Additional range scales are permitted outside the mandatory set.  Low metric range scales may be offered in addition to the mandatory set. 
  • The range scale selected should be permanently indicated.


  • An appropriate number of equally spaced range rings should be provided for the range scale selected. When displayed, the range ring scale should be indicated. 
  • The system accuracy of fixed range rings should be within 1% of the maximum range of the range scale in use or 30 m, whichever is the greater distance.


  • At least two variable range markers (VRMs) should be provided. Each active VRM should have a numerical readout and have a resolution compatible with the range scale in use.  
  • The VRMs should enable the user to measure the range of an object within the operational display area with a maximum system error of 1% of the range scale in use or 30 m, whichever is the greater distance.


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Amit Sharma

Graduated from M.E.R.I. Mumbai (Mumbai University), After a brief sailing founded this website with the idea to bring the maritime education online which must be free and available for all at all times and to find basic solutions that are of extreme importance to a seafarer by our innovative ideas.