On 12.01.2010 09:16, Charlie Ferrero wrote:

Markus wrote:

...

Dear professionals,

Mark has made a very nice nautical chart for www.OpenSeaMap.org <https://sourceforge.net/projects/openseamap/files/Maps/Garmin/baltic.zip/download> It works very well on handhelds!

Next week we will exhibit OpenSeaMap on the boat show www.boat-duesseldorf.com (23.-31. January, hall 14/G39).

Now I need your help: How can I make working the map on a Garmin nautical chart plotter?

Garmin *GPSmap 525* with SD-slot.

Sub-folder: "Garmin" File: "gmapsupp.img" Message: "Map format is not supported" and: "DK Copenhagen"

Thanks for help! Markus _______________________________________________

Playing around on the Garmin website (https://buy.garmin.com/shop/buym), it seems that only a very limited set of official Garmin maps are compatible with (or at least, available for) the GPSMap 525. All of them are marine maps.

It may be that marine maps have a slightly different format to the land-based maps. AFAIK, there are at least three Garmin map formats: old (pre NT), NT and NT2. I think mgkmap produces only old (pre NT) maps.

There are also three formats used by nautic maps. The old "blue chart"", the newer G2, and the newest being called G2 vision (including aerial photopgraphy). The G2 / G2 vision maps cannot be displayed by Mapsource - instead you have to use Garmin Homeport (which is not free). --GPSmap 525 it strikes me that this unit is not listed to be compatible with normal blue charts ( http://www8.garmin.com/cartography/mapSource/bluechartCD.jsp ). Also on the unit page of Garmin it seems the 525 is only made for G2 or G2 vision maps. So you might have to try out a nautic unit that is still listed being compatible with Garmin blue chart maps.

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On 12.01.2010 16:27, Markus wrote:

Hi Felix,

...

There are three formats used by nautic maps: - old "blue chart", - newer G2, - newest G2 vision (including aerial photopgraphy).

...

The G2 / G2 vision maps cannot be displayed by Mapsource instead you have to use Garmin Homeport (which is not free).

So the IMG is working on devices who can read "blue chart"? I think the IMG cannot be read on devices that only support G2/G2 Vision like the 525. The old blue chart AFAIK only had some additional linetypes and POIs for nautic purposes - but did not differ a lot from standard garmin .img maps.

Homeport: It is made for to use Garmin charts on PC? Is it also usable for to use OSM charts on Garmin? Is there a opensource "derivate" of Homeport?

Any other idea how to get OSM on marine plotters?

Thanks for help! Markus I don't think that mkgmap can write anything like the G2/G2 vision format. Therefore IMHO the gpsmap 525 is a bad GPS to try. First try an older nautic GPS that can still read "old" blue chart maps. Homeport is the PC program for nautic maps, like Mapsource is for streetmaps. (only that they ask 30$ for it).

Hi Felix,

set "TRE 0-4-23" and it might work.

Err, sorry to be thick but where is this set? Cheers, Mark