Summary: I purchased this unit about 2 years ago and have been in love ever since. It has alot of features that have come in very handy, and some that I still haven't completely figured out. The guy who speaks about interference is, in my opinion wrong.
Humminbird 587ci HD Waterproof Marine GPS and Chartplotter with Sounder
Eloi "good items", Amazon
30 March 2013
Summary: The Humminbird 587ci works very well. The display is bright and clear. The Avionics Hotmaps Premium South Lake Map software is not so good. It can not distinguish the marsh from the water and therefore they appear in the same color.
Summary: This may be a good unit once you learn how to use it. It does not come with a user manual, comes with a disc. I do not have a desktop or laptop on my boat. I had to print out over 40 pages of instructions and still did not have all the information needed to fully utilize all capabilities of this...