By far, the best sail nav app available – SeaNav Review

Of all the apps I've tried in this genre, this is the very best one and well worth the $$. The vector maps are amazing in detail, easy to read and super fast even on older iOS devices (aka iPhone 4). Great in--route tracking and tracing. Amazing HUD. Fabulous for nighttime navigation. Active captain integration is terrific as well. My only wishes would we course integration with nmea 2000 devices (autopilot, etc). as well as easy export import of route plans between iOS devices.
Review by iPhoneGuy321 on SeaNav.