Re: Linux connection with Lowrance Airmap 100?

[Amos Shapira <amos@gezernet.co.il>]

From: John Peterson <jaypee@netcom.com>
>    I'm not real familiar with the Lowrance units, but I was under the
> impression that most GPS units use "vector style" map data.  Namely a
> database of points (airports, navaids, polygon vertices for airspace
> boundaries, roads, rivers) and associated lat/lon values.  Note that
> you need to have this data around somewhere for the unit to be able to
> calculate distance to waypoints, etc.  I beleive the map you see is
> rendered on the fly from the vector data by the unit itself.  If so,
> raster maps like you get when you scan from a paper chart would be
> useless.

John,

I wouldn't try to upload megabytes of scanned maps into this tiny unit :-).

What I would like to do is to be able to have a scanned map on my PC's
screen and "digitize" it by marking waypoints and writing them into a
file in an approperiate format.

As it is now, I can use the IMS software to do that, but I'd have to
somehow manually calculate the coordinates of each point I want to
insert from a hard-copy map and point/click it into the IMS software.
If I could load a scanned map as a background and simply click on the
image then it would be much more practical to get the data.

> 
> > Also, it looks like Lowrance are open enough to document their serial
> > protocol (LSI-100, IIRC), but as far as I skimmed through it it
> > doesn't describe a way to upload maps.
> > 
> 
>    Neat. Sounds like Lowrance has a customer friendly idea of "fair use",
> unlike most hardware manufacturers who have seemed to have adopted the
> Microsoft model instead. Look for a description of how to update the
> database, that might shed some light on the question / answer.

Thanks,  I'll try to look it up.

Cheers,

--Amos

--Amos Shapira                  | "Of course Australia was marked for
                                |  glory, for its people had been chosen
amos@gezernet.co.il             |  by the finest judges in England."
                                |                         -- Anonymous
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