491 Black Box Sounder/Fishfinder - 10% Off Red Tag Sale! Price shown reflects 10% discount. Northstar's 491 Sounder/Fishfinder :Northstars New 491 Fishfinder. All the information you need, all the time.The elite team of engineers at Northstar has called upon their vast experience, knowledge and expertise in sonar technology to bring you the 491 sonar module. This power packed module sets a clear standard in network sonar performance. A unit proven in design and by exhaustive on the water testing by Northstar engineers that know fishing.This unit offers you the same easy to use functionality and screen clarity for under-the-water information that you would expect from Northstars unmatched chartplotter, GPS and radar.Northstars legendary SoundTrac™ gives you the ability to scroll back to a target in the screens history, mark it, and easily navigate to it. The Northstar 491 is feature rich: 50/200kHz. 600/1000W. Bottom Lock. A Scope. White Line. Alarms for depth, fish, and temperature. Northstar matched transducers. Each feature can be tuned to fit your needs. Or, simply leave the 491 in auto mode and start fishing.Enhanced Target and Bottom DiscriminationSoundTrac™ Navigate Back to a Target in the Sonar History Screen 50/200 kHz @ 600/1000WA-ScopeBottom lock Combined With Multiple Levels of Zoom Allows Closer Inspection of Targets Near the Sea BedGraphic Gain Control makes understanding and using gain settings simple 
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