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

Tue Aug 4 21:55:54 BST 2009

Mark Burton 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.
>   
Is this patch only for marine types (think --> I have to put my gps into 
marine mode) or also for any mode, and shown by typfile as used by 
"garmin's own" topo maps?
I'm wondering why the number is 6 digit hex and not 5 digit.

Especially for linetypes some more would be really useful. Also it would 
be nice for POI that you definitely don't want to appear in any search 
function (like trafficlights, etc....)
> Extended types are specified as a 6 digit hex number. The first two
> digits are always 01. An example type is 0x010200 (point type Buoy).
>
> Points, lines and polygons can all be given extended types.
>
> The cGPSMapper user manual lists all of the types.
>
> Note that routable ways cannot have an extended type. If you try to
> give a road an extended type, it will converted into a line.
>
> 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.
>
> It now works well enough to warrant testing on more map data but I
> am expecting that there will be problems given the extent of the patch
> and the nature of what it's doing.
>
> Please test if you can and report success/failure/etc.
>
> Cheers,
>
> Mark
>
>
>   
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>
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