Well after I brought my third Lowrance X-107 back to West Marine I decided I had enough with Lowrance or at least that model anyways. The Salesman at West Marine recommended that I try out the Garmin 178c gps/sonar with internal antenna. I got it and installed it. It was very easy to install. I got the transducer with 200/50khz speed and temp. Once I got the transducer on and all the wiring squared away, I turned it on and initialized the gps. Within a minute or two it was accurate to within 10 feet and had full WAAS signal and I live with trees all around me. This unit comes with a worldwide basemap which it pretty vaque but I also got the bluechart chip for my area. Once I loaded the bluechart I couldnt believe my eyes as to all the details it has on it. This unit has so many features that I could write about them for hours. I live on the coast so it will tell you the tides from all the different tide stations. Marking waypoints are very easy, it will tell you where all the wrecks are, bottom depths, marker bouys, I mean everything.The sonar is very strong too, it has 4000watts peak on the 50khz and like 3200 on the 200khz. You can easily see the screen in the brightest light and its easy to dim for night fishing.I would highly recommend this unit over anything else, for the money this gps/sonar is the best you can get in my opinion. Any more questions on this just pm me and I would be happy to answer any of them.