Alternatively, place POIs along the coast (how dense depends on the accuracy you want to have). Calculate the minimum distance from the set of POIs.<br><br><div class="gmail_quote">2009/6/28 mqy <span dir="ltr"><<a href="mailto:meng.qingyou@gmail.com">meng.qingyou@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
hi lanzo,<br>
<br>
I have to say that your problem is interesting, but it's a bit too specific<br>
for a GPS application to do this.<br>
One quick and dirty solution is:<br>
<br>
You write a small application which:<br>
1) calculate a polygon area which contains the allowed range. to do this you<br>
have to use web map or standalone map. The polygon nodes are lat/lon pairs.<br>
2) get GPS fix from fso ogpsd through DBUS API. this is not difficult with<br>
python<br>
3) periodically (say every five seconds) test if current position goes out<br>
of predefined area.<br>
if the test result is true, then warn with sound (aplay command).<br>
<br>
To see where you are, you can run a GPS application at the same time.<br>
<br>
I'm the writer of omgps, I'm planning to extend omgps to solve this kind of<br>
problem --<br>
allow user register his/her python script as plugin, omgps periodically call<br>
each plugin,<br>
passing parameters of current lat/lon/altitude, etc. Periodically can be<br>
defined as: (1) on each fix (2) every N seconds.<br>
<br>
Welcome your feed back :)<br>
<div class="im"><br>
<br>
lanzo wrote:<br>
><br>
> Hi!<br>
> I'd like to be using my FR on my little boat as marine GPS. I was curious<br>
> if, in your opinion, it could be possible to constantly show the distance<br>
> between me and the nearest point on the coast line. This would be<br>
> important because in my country (and i guess everywhere) there are rules<br>
> about the little boats distances from the coast and I cannot overcome 3<br>
> nautical miles.<br>
><br>
> I know it should be possible to show the distances between my present<br>
> position and any given point, but what about something always displaying<br>
> the distances between my position and the nearest point on the coast?<br>
><br>
> is there maybe any more in-topic forum where i can ask this?<br>
><br>
> Thank you very much for any answer!<br>
> bye! :)<br>
><br>
<br>
--<br>
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