Thread: [ANNOUNCE] Columbus Navigation Toolkit
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bobh is offline bobh
2010-12-24 , 17:20
Posts: 62 | Thanked: 62 times | Joined on Jul 2010 @ New Hampshire, US
#54
Originally Posted by Sergey Fedchenko View Post
Nice app! Congratulations!
I have some questions.. What is the reason to add fixed height of geoid in GGA string? And whether it makes sense to transfer GLL, VTG and ZDA strings? I tested a similar program for several weeks with some client applications (SAS Planet, OziExplorer, gpsVP, Navitel ets.) and decided not to use that elements. On my N900 the attribute of MagneticVariation always comes without validity confirmation. Is it a bug of pr.1.2?
ZDA has the complete date + time in one message, GGA and GLL have only time of day.

On the mag variation, the NIST issues an updated set of model coefficients every five years. Perhaps the N900 knows that it doesn't have the 2010 update?

On the other hand, reasonably-priced magnetic compasses aren't going to be accurate enough for it to matter.
Last edited by bobh; 2010-12-24 at 17:22. Reason: Slightly mis-stated message contents.
 

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