I first got InavX when I installed a wi-fi enabled AIS to supplement my on-board navigation instruments. I really like the route making capability and the fact that I can import/export routs between my IPhone and IPad. I also like the ability to track AIS targets with it. I downloaded Gribs while offshore with my Globalstar phone on two crossings of th northern Gulf using XGate and a Redport optimizer. I am currently assisting a friend who is in SW Florida teaching an ASA class with weather forecasting using the weather functions. Impressive app. Now if only I could get my on-board radar on it too! This is a five star app!