I'm sure there are many of us using this app. I just bought myself a 4th generation iPad to play with. I have been using my Eldridge Tide and Current book when planning my weekends. Playing with this app I see the current arrows with drop down charts showing time and speed. My book is on the boat so I can't compare the two. Anyone been using this app long enough to validate its accuracy? It's comforting to know I am going through woods hole with a favorable current