Hover or tap underlined Spanish terms to see their translation and exam tip.
¿Qué factor puede hacer que un sistema AIS de una embarcación de recreo no detecte a otra embarcación cercana?What can stop a pleasure boat’s AIS detecting a nearby boat?
Show the answer
Correct answer: c) The other boat not having an AIS transponder on, or not carrying one.
Why it is correct
AIS is not radar: it only shows those who transmit. A boat with no transponder, or with it off, will not appear however close it is.
Why the others are not
- a) Being close does not stop reception.
- b) AIS works on VHF, not medium or short wave.
- d) What counts is transmitting, not the hull.
How to work it out in the exam
- Ask whether the other boat transmits.
- That is why AIS does not replace lookout.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2025 · Convocatoria de noviembre · PY Test 1 · question 29 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2025 · Convocatoria de noviembre · PY Test 2 · question 30 Official paper · Official answer key
Try it: Navigation instruments
Pending instructor review. Machine translation, not reviewed.