> I'd like to create sea maps for my Garmin. 
> 
> I know how create land maps for it, but I want to see seamarks and so on.
> 

Hi,

my map (
http://wiki.openstreetmap.org/wiki/DE:OpenSeaMap_and_Garmin_nautical_chart_p
lotter ) is made especially for the Garmin marine device series. Those
marine devices have some problematic restrictions which makes map making
very complicated. My map works on most non marine devices anyway, but could
look better on those units.

If you want to create your own map that makes better use of Garmin handheld
device´s capabilities, things should be lot easier as you don´t have to care
for marine device´s restrictions:

1. Take someone´s mkgmap style of a Topo (hiking or mountain biking) map,
that looks good on your device.

2. Include the default marine style (seamark layer) to this style. You have
to download mkgmap sources and find it in recources/styles/marine.

Unfortunately mkgmap´s seamark rendering capabilities are very outdated.
Most older seamark tags are rendered. Some seamarks (about 500 in Europe)
cause warnings or errors. But all the new seamark tags defined lately for
the upcoming iENC import or water depths are not yet supported by mkgmap, at
all.

It would be a good idea, if someone familiar with the latest seamark tagging
scheme could explain it to the mkgmap developers. Otherwise we will end up
with great nautical data in the OSM database, that cannot be used on the
water, because it cannot be brought to our GPS receivers.


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