I have it and it is really cool. I don't really need it because I just go to one lake, I sure it will come in handy some day. Have you tried the gps apps. They work really good. There is one that will clock your 0-60, 1/4 and so on. Not sure if it works real well just got it. I have speed box lite works great dead nuts on with my garman and updates very quick. Gtach is the 1/4 mile timer ? I talk speed will say your current so you can plug in the head phones and hear your speed. This one updates kind of slow and dot sure on accuracy. Speedometer work ok also. Speed box seems to work the best. The iPhone is the best thing to have in your boat. You nav, vid, pics, speed, phone, computer, access to this site, all on the lake. Take a vid send it direct to you tube and it takes great vids that you can crop just what you want bang done on the web.
