OK, How can ya give Ostia a 7 out of 10 when this is the first GPS software you have tested?
I would at least try 3 different products so that I could do a proper comparison. How about trying Pocket Map Navigator with a Holux GPS antenna and maybe Mapopolis.
I have both Mapopolis and PMN and they are both great!! I don't experience the long wait on a re-route.
