The 378 is first and fore-most a marine chartplotter. With the exception of radar, the unit has every feature found on the much larger units we use on-board a 32' research vessel. Display is readable, even in direct sunlight; screen regeneration is very fast.
When used on the road, navigation is no different than any other Garmin GPS (it uses the same RoadNavigator software package). The only negative critique is that b/c it does not have a touchscreen, inputting waypoints can be somewhat monotonous. It also lacks some of the more useless gimmicks - my position indicator is only an arrow, I can't get an animation of a truck up on monster tires.
This unit is clearly meant to be a highly functional, no gimmicks navigation tool. Because of all the features and its range of uses, you will need to spend ! some time with the manual to take full advantage of its power.
View product details at Amazon
