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The Humminbird 587ci HD DI is a combination GPS and fishfinder that includes Humminbird’s trademark Switchfire and Dual Beam Plus sonar technologies as well as their Down-Imaging system all displayed on a high definition 256 color 4.5 inch 640×480 resolution screen that has brightness levels that can be adjusted to read clearly even under direct sunlight. Switchfire brings to the user two modes of sonar viewing. The first is a maximum mode that brings incredible detail of the world below to the screen. Not only the expected cover and bottom, but also water current as well as thermoclines. The second is a clear mode which is for those times when the water is shallow, murky, or filed with sediment. These are times when getting every detail simply fills the screen. Clear mode filters out the unnecessary noise and gives you a clear picture under these challenging situations. Switchfire technology gives the user a detail option under conditions that make other sonars useless. Dual Beam technology sends a 20 degree 200 kHz and a 60 degree 83kHz sonar beam under the boat. The wider beam covers an area that is as wide as the depth of the first beam. These beams can be viewed side by side or in a combination mode thus giving the user a picture of the bottom as well as the surrounding area allowing the sonar to pick up all fish in the immediate area.
Down imaging is added to the feature packed Humminbird 587ci HD DI. Down Imaging is a sonar system that focuses thin slices of sonar waves below the boat in order to produce a detailed image of not only the surface but all cover, structures, and details of the area below.
In addition to these features the Humminbird 587ci HD DI also has an internal GPS system that can track 3,000 waypoints, 50 routes, and 50 channels and includes chart plotting, built in Uni-Map cartography, and an SD card slot for saving additional maps like Navionics and LakeMaster as well as additional waypoints and routes.
The unit is mounted on the included tilt and swivel quick disconnect mount has 2400 W peak to peak power and drop in replacement capability. This is an all in one unit that is affordable, versatile, and a solid budget minded choice.