Back to topic, as you wrote, it's too expensive, doing complicated
algorithm, which can calculate 'sea way'. I think, mentined below will
be enough.

So, our ports, and ways - there is not too much that. In this case it
is possible to manually draw polly lines, which conncect two port-
points and save them in database. Now, if whenever part of itenerary
has this two ports way, it get polyline params from db and draw them.
After some time we collect probably all sea-ways combination, which we
need, and have nice auto-drawing mechanism.
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