Been using this unit for over a month. The gps is highly accurate, contrary to what a few other reviews said. The tracks function does wander slightly while standing still but it’s made for people who are on the move. I loaded both purchased and free maps to both the internal hard drive and the SD card without issues. I also created some custom maps for use on a trip. Text notifications work instantly and I like the button versus the touch screen especially in a cold climate for hunting. The screen is small but amazing in both low light and bright light conditions. The battery life is also good with plenty of settings for your needs. I love this unit.

4/21/14 Just got back from Saint John, VI. Took my GPSMAP 64 down Reef Bay Trail to Lamesur Trail, with dense cover, all the way to the tip of the Island in the SE. The hike was about 8-9 miles. I then hitchhiked back to our resort and left my gps running. The round trip totaled about 20 miles of mountainous, windy roads and as I said, thick, lush cover. I later reviewed my “tracks” to find my path perfectly lined up with both the topo and custom maps I installed prior to my trip. I had no wandering data and my track never deviated more than roughly 4-5 feet. I took two sets of rechargable AA batteries on my trip and didn’t get down to one bar (low), with the first set, until day three and roughly 16 hours of use, with some intensive data entry. While putting together my adventure with the photos I took with my iphone, I like how the software, Basecamp, drops the photos on my map where they were taken from the embedded geotag (will work with any camera that geotags photos). The only thing that could maybe be improved or maybe I haven’t figured it out yet is that I’d like to be able to save my trip data within the unit instead of looking at it on my mac. If you save your trip to BaseCamp you can easily see everything you need (avg speed, distances etc). Finally, while the altimeter is not perfect, I calibrated it at the ocean and seemed to always be within 5-10 feet. That’s it for now!

I like a few things better on this compared to my previous GPSMAP60 CSX, but a few things are not so good. The good is the 64 can now store 200 tracks instead of the previous 20. The bad is you cannot type in GPS coordinates and click go to. How weird is that? The new Base Camp which pairs with this on your home computer has also lost some its functionality compared to the previous Mapsource. On Base Camp you can no longer add points to an existing track, split the track, do some editing and rejoin the track. I just don’t understand when useful features are removed in an “upgrade”.