[ gpsdrive ] libgps and speed/track

[Paul Martin]

Depending on the order of the NMEA sentences from the receiver, we can
receive NaNs back from libgps. The following patch ignores the information
if it's not flagged as valid.

It might be a good idea to apply similar checking to the other values we get
back from libgpsd.

-- 
Paul Martin <pm at debian.org>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: speed-nan.diff
Type: text/x-diff
Size: 1303 bytes
Desc: not available
URL: <http://lists.gpsdrivers.org/pipermail/gpsdrive/attachments/20090101/695c4c04/attachment.bin>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: Digital signature
URL: <http://lists.gpsdrivers.org/pipermail/gpsdrive/attachments/20090101/695c4c04/attachment-0001.bin>