OREGON 600 IS IN LIKE NEW CONDITION AND LOADED WITH A BRAND NEW 2017 MARINE G2 CHART THAT JUST CAME OUT LAST WEEK. THE 600 IS MORE ACCURATE THAT THE 78SC BECAUSE IT RECEIVES BOTH USA & RUSSIAN SATELLITES. I AM GIVING AWAY THE LOADED TUNA FISHING DATA FOR FREE $550 THIS IS A GREAT BACK UP UNIT FOR A CHARTER BOAT. 2017 NEW CHART COST $180. I BEEN OFFSHORE MANY OF A TIME WHEN THE MAIN GPS SYSTEM GOES DOWN. $550