Hi Sam,
ferries get class 3 for routing, which is high. They should be easily
used in routing when allowed in GPS.
If the problem really is low routing class of service roads, then I see
2 solutions:
Convince OSM mappers to add more tags for "highway=service". This could
be for example "service=ferry". Or add any other indication, that these
roads carry important traffic, for example include roads in a relation.
Then this could be processed by mkgmap.
Second solution would be to try to catch the problem by mkgmap. I think
there are more similar cases, where 2 important roads are connected by a
link or roundabout with significantly lower routing class. Mkgmap could
include following algorithm:
Find all suspicious objects, like highway links, roundabouts, service
roads connected to a ferry and analyze other roads connected to this
object. If any of these other roads get road_class 3 or 4, then increase
road_class of processed object accordingly to 3 or 4.
--
Best regards,
Andrzej
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