[Tagging] Ferry routes, what's the correct approach?

[sabas88]

Hi,
I started discussing in the local list about the approach in tagging ferry
routes.
The wiki page [0] seems a little bit unclear, leaving two approaches:
-normal way between harbours
-relation like a normal road.

I tried to follow the relation approach like I saw in other seas, but I
cannot understand why routing on these ferries is so difficult.
For instance in some cases the router suggest to change ferry in the middle
of the sea, or suggest a route which minimises the sea crossing: between
two harbours with a direct line, it goes through land till it find another
route.

So, my question is: it's fault of the tagging or the routing? What's the
correct way of tagging?

Regards,
Stefano


[0]http://wiki.openstreetmap.org/wiki/Tag:route%3Dferry
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