FishMark 320 Portable is a discontinued product

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Port-Power Pack case and portable 200 kHz Skimmer® transducer with suction-cup mounting bracket (batteries not included)
5" (12.7 cm) diagonal screen
High-definition 320 x 320 Film SuperTwist LCD
16-level grayscale
Depth capability to 800 ft* (244 m) with 1500 watts of peak-to-peak power (187W RMS)
FishReveal™ feature exposes fish targets hidden in surface clutter, weed beds, thermoclines, and other types of underwater cover
Adjustable ping speed with automatic HyperScroll™ to display fish targets at higher boat speeds
FasTrack™ vertical bar flasher displays real-time sonar returns and relative strength of each target
Advanced Signal Processing (ASP™) automatically adjusts your settings for the best sonar picture
Patented GRAYLINE® separates fish from nearby structure and bottom
Advanced Fish I.D.™ shows underwater targets in different sizes of fish symbols
FishTrack™ displays target depth readings above fish symbols
Selective on/off sonar alarms: Shallow, Deep, Fish and Zone
Rugged, reliable, completely sealed and waterproof casing, even for use in harsh saltwater environments
Full one-year warranty