I have had too many reliability issues with my Garmin 78sc handhelds and am thinking of adding an iPhone mapping app. I don’t need too many features. The attribute that I can think of that would be selling or sticking points are (A) speed in tenths of knots or mph (preferably in big enough font that my eyes can see them without getting out my glasses), (B) easy to add waypoints (like tapping on the screen or entering current location at the touch of a button), © and use of cellular rather than GPS signal unless there IS no GPS signal as I hear GPS signals use battery very fast. My main use would be to check my speed when trying different strokes and in different conditions and as a navigational aid to get me back to the launch point if my eyes, memory and other cognitive skills aren’t doing the job. So just something that would show my position on a map. I don’t know if I prefer raster or vector charts, and I don’t really understand how a subscription service works but it doesn’t on the face of it sound appealing.