Hi Gert,
i just build mkgmap out of svn trunk and test it with a single marine/ext poi in an mp-file. It works.
Good.
But i discovered that neither the flashing nor the morsing works in Mapsource or in my 60csx . I guess these functions are only avaiable with special marine gps of Garmin.
No, they should certainly be visible in mapsource (I am using 6.15.6). My etrex also does show marine stuff. So if you are using a recent mapsource and stuff isn't showing up, perhaps I have made a mistake and something needs fixing? The morse and flash info only shows up in mapsource if you look at the POI properties dialog.
A nice enhancement is the "note=" or "mkgmap:xt-note". I got up to 200 signs in this container displayed on my 60csx.
OK.
This is more as double of what you can normally put in "StreetDesc=" of a POI.(sorry i don't know the tag in osm. In Mapedit you can write it in the objekt properties=>Address=>Street and in the mp-file it is the "StreetDesc=" entry).
Cheers, Mark