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.
2009/6/28 mqy <[email protected]> > > hi lanzo, > > I have to say that your problem is interesting, but it's a bit too specific > for a GPS application to do this. > One quick and dirty solution is: > > You write a small application which: > 1) calculate a polygon area which contains the allowed range. to do this > you > have to use web map or standalone map. The polygon nodes are lat/lon pairs. > 2) get GPS fix from fso ogpsd through DBUS API. this is not difficult with > python > 3) periodically (say every five seconds) test if current position goes out > of predefined area. > if the test result is true, then warn with sound (aplay command). > > To see where you are, you can run a GPS application at the same time. > > I'm the writer of omgps, I'm planning to extend omgps to solve this kind of > problem -- > allow user register his/her python script as plugin, omgps periodically > call > each plugin, > passing parameters of current lat/lon/altitude, etc. Periodically can be > defined as: (1) on each fix (2) every N seconds. > > Welcome your feed back :) > > > lanzo wrote: > > > > Hi! > > I'd like to be using my FR on my little boat as marine GPS. I was curious > > if, in your opinion, it could be possible to constantly show the > distance > > between me and the nearest point on the coast line. This would be > > important because in my country (and i guess everywhere) there are rules > > about the little boats distances from the coast and I cannot overcome 3 > > nautical miles. > > > > I know it should be possible to show the distances between my present > > position and any given point, but what about something always displaying > > the distances between my position and the nearest point on the coast? > > > > is there maybe any more in-topic forum where i can ask this? > > > > Thank you very much for any answer! > > bye! :) > > > > -- > View this message in context: > http://n2.nabble.com/which-gps-app-can-do-this--tp3169715p3170060.html > Sent from the Openmoko Community mailing list archive at Nabble.com. > > > _______________________________________________ > Openmoko community mailing list > [email protected] > http://lists.openmoko.org/mailman/listinfo/community > >
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