No, only 32bit unsigned integer.
Hi M and J,
I've also just found out, no.
I'm not sure we need such an accurate calculation, as, I imagine it will work like this:
If $GNRMC,162254.00,A,
3723.02837,N,12159.39853,W,0.820,188.36,110706,,,A*74
is compared with $GNRMC,162254.00,A,
3723.02838,N,12159.39853,W,0.820,188.36,110706,,,A*74
and they're different, than move to the last location sent.
All this can be worked out later though, as there may be different 'best' ways to do it.
C