For many people,
boats are the only means of transport that they have.
Of course, the boats are used for all purposes!
on the side of the boat is written
(while he may be found)...
To show another boat... - "JESI NA
JEHOVAH" - "Listen to Jehovah".
These incentives are expressions of faith
based on the bible. Seek ye Jehovah while he may be found,
call ye upon him while he is near. The second text could be
Joshua 3:9: "... Come hither, and hear (or listen to)
the words of Jehovah your God".