Hi Nick,
I'm looking for a method to convert S-57/ENC NOAA marine charts to Garmin format.
:-) Transform it first to OSM (see OpenSeaMap scheme). There is a approved tool working as plugin with FME. If you find an access, the transformation seems to be easy. Malcolm has written a S-57-to-OSM writer... May be you like to join in to the OpenSeaMap-dev-ML: https://lists.sourceforge.net/lists/listinfo/openseamap-develop Than we can transform it to Garmin: http://wiki.openstreetmap.org/wiki/OpenSeaMap_and_Garmin_nautical_chart_plot...
NOAA updates their vector based charts regularly, so it's a good data source now.
:-)
mkgmap, GDL ogr and OpenCPN, all of which have some of the functionality to put this together.
:-)
The mkgmap Java source is pretty extensive and well organized
There are some unsolved tasks to do around areas etc. Jürgen is talking about on this list. Best regards, Markus