I understand that propane is the most common cooking fuel
in the world so it is probably available most places in the world. The trouble is that it might not be available near the dock
and the fittings might be different in other places.
If you are just using it to push a dinghy
speeds, the little 2.5 uses so little propane that you can carry many hours of fuel
on board. A twenty pound bbq tank would run it for more than twenty hours.
The bigger the engine
, the more I'd be concerned about the availability of propane.