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Car alarms go off all the time on ferries from cars that really don't like being locked and moved.
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Ferries tilt and jolt in a way that predictable-path car lifts don't.
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Yes I see this all the time on BC ferries. Usually an Audi or similar
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The problem will be aftermarket car alarms. There used to be a car that parked on the street near my apartment that would go off ever time a bus went by it.
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Some OEM systems are sensitive too. My mother has a Hyundai that triggers the alarm whenever a heavy truck drives by.
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There's even a somewhat famous song about that: https://www.youtube.com/watch?v=6Z-8vy6sPQQ
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