Lowrance Mark 4 Fishfinder Plotter

Lowrance Mark-4 Fishfinder Plotter includes impressive detail on the 3.5 in/8.9 cm screen that virtually expands to 4X its size with the integrated >Trackback feature. TrackBack gives you greater control of your time on the water. Simply move the cursor back through sonar-display history, quickly identify baitfish, game-fish or structure and save a Waypoint. The Lowrance Mark4 GPS Fishfinder is easy-to-install with a quick-release mounting system featuring tilt and swivel bracket for plug-and-play use.  For fast and smooth one-hand operation, the Mark-4 design includes easy-to-use page and menu controls. Comes preloaded with a basemap,  

• 3.5" 16 level grey scale 320V x 240W Pixels, 70mmL x 54mmW daylight viewable Mono LCD display.
• New, easier-to-Use Menu Selection.
• Trackback history.
• Navionics Silver or Gold map options ( What is the difference?)
• Completely sealed and waterproof. Built-in flush mount kit.
• Internal lithium battery keeps data for up to 10 years.
• Alarms - shallow, deep & Fish.
• 3000 Waypoints 100 routes
• 200/83KHz  Output power: 2100w(ptp) or 262.5w(rms)
• Useable depth: 60m.
• Depth, temperature and Speed