I need some honest reviews. I'm looking to put a Fishfinder/GPS unit on my new boat. I've been researching these things and reading everything I can about their capabilities and such. I've got a couple questions and I value you guys opinions. I keep coming back to a Lowrance with Navionics+ preloaded on it. I started looking at the 5" now I'm trying to convince myself that the 7" would be better. Is the 7" screen worth the extra $100? Also, I had a guy tell me about a Raymarine Drangonfly. I've been checking them out a bit and I like them. The 7" Dragonfly was Wifi capabilities where it will project onto my iphone in the boat. Which would be a nice feature. Be nice to have the head unit on the dash and have the phone up front on the deck with me. Anyone have any experience with either of these units?