I just got the new Rand McNally TND 740 while coming from the TND 510 and I'm not impressed with it as I'm thinking about going to the TND 530 instead.
your 510 software is way out of date, newer device version has compare route as well & is much quicker; although nowhere near the speed of a 530 obviously. the 530 constantly losing GPS signal & bouncing current location icon all over worries me they they used an inferior GPS receiver module in the newer version...
I just got the new Rand McNally TND 740 while coming from the TND 510 and I'm not impressed with it as I'm thinking about going to the TND 530 instead.
your 510 software is way out of date, newer device version has compare route as well & is much quicker; although nowhere near the speed of a 530 obviously.
the 530 constantly losing GPS signal & bouncing current location icon all over worries me they they used an inferior GPS receiver module in the newer version...