i have a 798 ci si with maps have been very disappointed with it haven't see a fish yet , and the depth of the water jumps from one figure to another and does not read with any boat speed. if in shallow water it does not work worth a dam ,i have a 200 dollar one on the front that's works better. the maps work good but that's all. the side image is a joke and i challenge any one to show me a fish. you might think its a fish but your just fooling your self,my friends laugh at this thing its a joke for what it cost . i hate to buy somthing thats not what they say it is .sure wish it worked good.