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Gas and propane fumes are most likely accumulate in the bilge and cabin floor area.
Without proper ventilation, the fumes are likely to accumulate in the bilges (the lowest part of a boat).
Bilge
In the bilge.
Bilge
Bilge
Bilge
bilge
bilge
in the bilge
bilge
Moisture can accumulate in any headlight, most likely the cause is a bad seal between the two pieces of the fixture.