Saltwater Kayakers: Get This! – Navionics® Boating Review

The iPhone version is superb for ocean Kayakers. App shows tide & current info; invaluable for those of us paddling at 2 or 3 knots. Get the app then purchase the Navionics map subscription - you wil not regret it! And pick up a cheap battery pack on eBay so u don't drain the iPhone battery before your body poops out.
Review by BugBitten on Navionics® Boating.