Do not buy this unit if you are intending to use a Navionics chip like Hotmaps Premium in it. You will have wasted $150.00 on a chip only to be frustrated as all get out and want to throw the Elite 7 HDI in the lake. The processor will not handle it and you will hate the unit. It takes forever to update when zooming in or out. Instead choose the Fishing Hotspot Pro USA 2014 chip to use in the Elite 7 HDI,which is a Lowrance chip,it will do alot better. Be sure and mount the transducer on the transom instead of the bottom of the trolling motor. You need more speed to get the clearest image. Lowrance should be ashamed to advertise it will handle Navionics with the Elite 7 HDI, it is a disservice to the buyer. With these two sticking points avoided the Lowrance Elite 7 HDI is a descent unit!

PS
It gives very good down imaging shots of timber and fish. Will post screenshots over the next few months. So stay tuned!