gpx logging: do not log 0000 0000 postions

[udo]

For the gpx logging navit should ignore the 0000 0000 positions that GPSses might give when starting up.

[RedDog]

vehicle_log_gpx() handles this: if (!this_->meth.position_attr_get(this_->priv, attr_position_coord_geo, &pos_attr))

Maybe something like this (patch attached) may help here. Patch is only an idea, not tested ... (maybe not the best to handle this)

[KaZeR]

Thanks for the patch, but better would be to check fix_type in the gpx log. There might be cases where position_coord_geo should better return the old values instead of nothing : for example if you want to re-center the map at your current position, and you have weak gps reception, nothing will happen. When position_coord_geo returns the old values, the map will at least re-center at you old coordinates

[RedDog]

I attached a new patch... It's not tested! Only for RFC..

[akashihi]

Fixed in ​r3381

Thanks for your patch! I've modified it, so it checks, whether fix is valid only if fix_type retrieval was successfull