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Radar revision module 6 of 9

AIS

AIS, MARPA, and Overlays

Using AIS and MARPA alongside radar without over-trusting either.

AISMARPA

4 guided lessons · 8 practice questions · 8 flashcards

3 outcomes · self-guided revision
  • Explain using AIS and MARPA alongside radar without over-trusting either.
  • Apply AIS to a realistic onboard situation.
  • Recall the core check: aIS is not a complete traffic picture.

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Lesson routeThree Different Evidence Streams0/1 read

Lesson 1 of 1

Three Different Evidence Streams

Radar, AIS, MARPA, and chart overlays can agree, but they are not the same evidence. Radar detects echoes. AIS receives transmitted data. MARPA tracks selected radar targets. Overlay combines radar with chart and heading/position sensors.

The safest operator compares them and investigates disagreement instead of choosing the most convenient display.

  • AIS is not a complete traffic picture.
  • MARPA quality depends on radar picture and stable tracking.
  • Chart overlay depends on heading, position, and chart alignment.
  • Radar can detect non-AIS targets.
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