[ gpsdrive ] Nautical maps

[stuart bell]

On 29/02/2008, Hamish <hamish_b at yahoo.com> wrote:
> tartifola wrote:
>  > I've recently discovered gpsdrive and I like it very much.
>  > I would like to use it for sailing and after some search I was not
>  > able to find any reasonable nautical map? Any hints where to look
>  for?
>
>
> what part of the world are you in?
>
>
>  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
>
>
>  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,

Thanks for the reply. I'm in UK but boat always in the Med as far too cold here.

Would be nice to sort this out so I can format the XP partition on my laptop!

Stuart
>
>
>
>  Hamish
>
>
>
>
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