One of the things that amazes people is when I show them the different capabilities on their Navionics App on their phone or tablet. Everyone assumes they are just for maps and depths and contours. Here is a screenshot with a bunch of icons on it (sailboats, forks/knives, red blocks with numbers, etc.). If you doubletap on any of those icons you will get much more information. The two screenshots are the screens you get from doubletapping on the red block with the number (1) and the fork/knife (2).