I believe magellan has a similar unit ... either way where you get
milkd is with the maps. Make sure you read the LICENCE POLICY BEFORE
purchasing the unit.

Garmin, i.e. will let you use the bluechart maps on TWO gps only. If
you have two GPS and sell one to get a new one you will not be able to
install the maps on the new GPS...

276C has a one of the best displayes. Compare units in your hands
before purchasing

Matt