Saved me!
My chart plotter quit on the eve of my single-handed 100-mile race; I thought I was done. A quick check on the Apple store revealed iNavX, I thought Id give it a try. It was great! I plugged in my Waypoints and, unbelievably, I was off finding my way around Lake Ontario even in the dark. Now I will always have a backup.
helmalee about
iNavX: Marine Navigation, v5.0.3