I ordered this unit just as it became available after conducting assessments of several units. Works just as expected. It takes a little getting used to the menu system, but after playing with it on two different occasions for about an hour total, I've figured out the more advanced items. Worked great right out of the box, quickly acquiring a full complement of satellites while I sat inside the house (accuracy within 10-14 feet inside). The screen has good color and is clear to read. I like the paperless feature and easily loaded a gpx file from geocaching.com. I find the ability to read all of the logs very helpful. Update: used it to search and find several nearby caches, and it worked great! It was very accurate and brought me to within a few feet of each cache. The receiver allows me to mark a cache found and to include comments. When I returned home, I easily uploaded my finds and comments to geocaching.com. I am very pleased with my purchase.
I have been running a GMR404 for about a year. Really like the unit. Have not had any low voltage issues on my boat or any other problems with the unit.
It's expensive but it's the best GPS unit I've owned so far! The unit is easy to use, quick and beautiful. There are a lot of software/display tweaks in the 2013 line that alone (for me) make the upgrade totally worth it. I had a 3590 and I have no regrets so far upgrading to the 3597.
The product arrived in a timely manner, and was exactly what I needed to properly place my Garmin Nuvi.
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