I have a competitors app on my iPad and a competitors software in my actual chart plotter. This app cost me nearly $50 (same price as the comp app) however has very little functionality compared to the others. The basic use is there however if you want something less "clumsy" with some friendlier features, Id strongly advise doing your homework before investing here... Not an app I trust in tight or shallow waters - at least not at this juncture; repairs to boats are too expensive.