[mkgmap-dev] [PATCH v1] - Add support for marine (aka extended) types

Wed Aug 12 12:36:28 BST 2009

On Tue, Aug 4, 2009 at 10:40 PM, Mark Burton<markb at ordern.com> wrote:
>
> Ahoy there shipmates,
>
> This patch is a first stab at providing support for the 3-byte extended
> types that are used on marine maps.

I tested this, and found that it works fine, both on my eTrex and in
Roadtrip for Mac OS X.

FYI, I did not have to switch to marine mode or anything else to get
the symbols to display. (Although some of  the symbols didn't look
that nice, but I assume they're there for utility and not aesthetics.)
So far, I have just tried this with a few types: a lateral buoy symbol
and a pier line type.

It would probably be nice to get this committed, so more people can
experiment with the additional possibilities this can offer.

> At this time, the various extra attributes that can be assigned to the
> marine entities (depth, colour, light colour/flash, etc.) are not
> handled but I have made some progress in understanding their encoding
> so at least some of these could be supported in the future. Obviously,
> the OSM data would need to be enriched to specify the required
> attributes.

There appears to be significant progress in adding this type of data
to OSM. Since the proposed tags attempt to conform to international
standards, it should be fairly easy to match these to Garmin types:

http://wiki.openstreetmap.org/wiki/Proposed_features/marine-tagging