Summary: I purchased a Garmin GPSMAP 378 in June 2006 and paid about $1300 for the unit and some extra maps. Really liked the unit until I went to update it in Apr 2010. The only map updates available from Garmin are over two years old. Garmin will sell you this old update for $70.00. Garmin no longer supports this product and will no longer provide maps according to the Garmin tech rep I spoke to on the phone.
Summary: This is a great tool, one of the best GPS i have, you can go from your car to your boat thanks to the features of this GPS, all USA city maps came with it and also the USA inside lake charts, no need to buy any extra maps. XM radio...with a subscription you get XM music, is great ..! and if you want to go forward you can update to a weather real time information. if you like the adventure this is the tool for you..!
Summary: 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).
Summary: Versatility of the 378 with it's XM weather was the reason I bought it. I haven't used on the lakes and rivers in Minnesota. I've used the automobile GPS and it works great. The screen size is perfect for my use. I will be using this on my 30' cruiser on an extensive river cruise this summer and I think it will more than fill the bill. I also realize that this a compromise product.
Summary: This is a great product displays road maps and marine charts.Voice turn by turn driving instruction. Bad weather ? No problem you can subscribe to XM and also have live Radar Overlay which is great for navigation.Fishing is a breeze with the built in fish sounderand while you're Waiting to catch the big one Enjoy XM Satellite Radio.
Summary: I love my gps. It does everything I need it to. It is very expensive, but youknow that before you buy it. I travel a good bit, and use it daily. You do need to read about it and learn all the benefits, and use them.
Summary: Loaded with lots of information. Would be easier to use if touch screen. Marine lake detail did not include my favorite lake which is the second largest in its State (44,000 acres). Bummed since I could not find a list of the covered Lakes at the Garmin site.