I tried out the
Navionics App on my
iPhone. It was $9.99 for the Central US version. It came with all the
charts, which have clickable points of interest, hazards, buoys, etc. When you tap them, it pops up with detailed information.
You can chart courses, track your course, track your distance, etc. and it gives you a
GPS estimate of your speed.
I spent another $10 to buy a universal smart-phone mount for a bicycle, which I attached to the binnacle guard.
So far the only downside is that the
screen is hard to see in the sun. If I had a
bimini, that wouldn't be such a problem, but I don't. It's great at night though because I dropped a marker on the charts to show the channel entrance to my marina. Makes it super easy to find in the dark.