[ gpsdrive ] Nautical maps

[tartifola at gmail.com]

Hi,

> what part of the world are you in?

I'm in Italy and I'm planning some sailing around balearic islands
(majorca, ibiza, formentera...)

> 
> 
> For the USA, NOAA makes charts available in a number of raster formats 
> (georeferenced??) or S-57 vector format. GDAL/OGR can read those for
> transforming into gpsdrive tiles.
> Also common for the US are BSB format raster charts (usually you buy
> the CD of your part of the coastline), but beware that newer editions
> may be encrypted for no other reason I can think of but pure corporate
> greed.
> GDAL can read those too. 
> 
> http://www.gdal.org/formats_list.html
> http://www.gdal.org/ogr/ogr_formats.html
> 
> once you find something GDAL can read you have a number of ways to get
> it into gpsdrive.
> 
> e.g. "gdal_slice.sh"
>   http://hamish.bowman.googlepages.com/gpsdrivefiles#tiles
> or via GRASS GIS's d.out.gpsdrive
>  
> http://grass.osgeo.org/grass63/manuals/html63_user/d.out.gpsdrive.html
> 

thanks I will give your method a try and I will post the list with my results/problems


> 
> take special care about the disclaimer about the software not coming
> with any sort of guarantee and not intended to be used as a primary
> means of navigation. The map scaling method is not as good as it could
> be. I've had pretty good success using gpsdrive at sea with scanned
> nautical charts as a backdrop, but sometimes a poorly registered map
> showed us a few hundred meters out, on land. (gdal_slice method with ~
> 1:500,000 regional maps, I never tracked down where I went wrong
> processing the data so I don't know if gdal_slice was to blame or not.
> d.out.gpsdrive stuff was fine AFAIR)
> 
> 
> Hamish
> 
> 
> 
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