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GPS_nmeaLib
Topic last updated 03 Jan 2012, by 
Guido Ottaviani.
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Guido Ottaviani.
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There is a bug in the GPS_nmealib (http://mbed.org/users/todotani/programs/GPS_nmeaLib/5yo4h) in the module gmath.c, exactly in the nmea_distance_ellipsoid() function.
The bug is in the original library by Tim (http://nmea.sourceforge.net), it always returns a zero distance if the arrival point longitude is equal or smaller than the starting point one.
in the same repository there is a proposal for the solution, bug report ID: 2945855:
http://sourceforge.net/tracker/?func=detail&aid=2945855&group_id=192054&atid=939854
The original gmath.c has been modified from:
while ((delta_lambda > 1e-12) && (remaining_steps > 0))
to
while (( remaining_steps == 20 ) || ((fabs(delta_lambda) > 1e-12) && (remaining_steps > 0)))