IEC PAS 60936-5:2003 pdf download Maritime navigation and radiocommunication equipment and systems – Radar – Part 5: Guidelines for the use and display of AIS information on radar
5.2.2Output of AlS information
The output from the AlS is specified by lEC 61162 messages (VDM/VDO). If AlS targets aretransmitted from the radar using the TTM message, then the type of acquisition field shall beidentified with the letter R.
5.3Processing of information
5.3.1 Zones and limits
If zones or limits for automatic target acquisition are set, these shall be the same forautomatically activating and presenting any targets regardless of their source. (C.217/2.2.1)Details shall be included in the manufacture’s documentation.
5.3.2Vector consistency
The vector time set shall be adjustable and valid for presentation of any target regardless ofits source. (C.217/2.2.2) Vectors from radar plotting and AlS shall be of the same “time’ength and shall all be consistent in presentation.
5.3.3Equivalency of radar plotting and AlS plotting functions
f radar-plotting aids are used for the display of A/S information, these shall be capable ofcalculating and displayin collision parameters for AlS equivalent to the available radarplotting functions.(C.21712.2.3)
5.3.4(CPA/TCPA) Alarm
in all cases when the AlS functionality is enabled and if the calculated CPA and TCPA valuesof an AlS target are less than the set limits,
an alarm shall be given; and
a dangerous target symbol shall be displayed when the system is set to the appropriaterange scale.
The pre-set CPA/TCPA limits applied to target data derived from different sensors shall beidentical.(C.217/2.2.4)
it may be possible to enable/disable the AlS functionality, When disabled, the AlS CPA andTCPA activity shall also be disabled.
When calculating the CPA/TCPA value of an AlS target the system shall use the lastCOG/SOG and/or position values as received from AlS. There shall be no filtering orprediction based on the rate of turn.
if a failure of own ship or AlS target COG/SOG or other parameters causes the calculatedCPA/TCPA value to be uncertain, a clear indication shall be qiven (for example AlS symboltriangle outline to be dashed.) Details of the clear indication method shall be provided in themanual.
The use of manual speed, set and drift and echo references shall be disabled when AlSfunctionality is enabled.
5.3.5Processing or display overload
An indication shall be provided, when the maximum number of AlS targets that can bedisplayed has been reached.
The system shall continue to function normally when the maximum anticipated number (forexample 500) AlS targets possible to be processed has been reached.
5.3.6Lost target
If the signal of a dangerous AlS target is not received for a set time dependent on thereporting rates of the AlS target (see Table 2), then:
a lost target symbol shall appear at the latest predicted position and an alarm be given;the lost target symbol shall disappear after the alarm has been acknowledged or after apre-set time: and
Means to recover the data for a number of last acknowledged lost targets may be provided.Preferably this function may also be applied to any AlS target within a certain rangeldistance.(C.217/2.2.5)
IEC PAS 60936-5:2003 pdf download
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