This was in the 717/727 manual. Humminbird 1 800 confirmed it, but I have not seen a plotter screen menu on the unit. I will look into it further and see if my GPS reciver will link up. WeatherSense® Fishing Condition Monitor:purchase and plug in the WeatherSense® accessory to your 700 Series™ Fishing System to obtainbarometric pressure readouts and trend data in real time.GR4 GPS Receivers:purchase and connect the GR4 GPS Receiver to your 700 Series™ Fishing System to access advanced FishingGPS™, trackplotter andnavigation capabilities built-in to your Fishing System.GPS Connection Cable:purchase the GPS Connection Cable in order to connect a handheld or other NMEA* GPS-compatible device that you may already own toyour 700 Series™ Fishing SystemWith the new InterLink™ Network Connection, you can now share GPSposition, waypoints, routes and your current track between two HumminbirdFishing Systems in real time. Mark a waypoint at the console, and its instantly531524-1_A – 717 & 727 Man_Eng.qxp 9/30/2006 7:24 PM Page 8278available on the second unit. No matter where youre at on the boat, youll haveaccess to your critical fishing and navigation information. Plus, daisy chainInterLink with other System Modules and youll have a network that lets youshare digital data around the boat. Its a simply, clearly, better networkingsolution!Last edited by Robolunge on May 27th, 2008, 1:36 am, edited 2 times in total.