Prices on this app seeems to go all over the place.
Yesterday I was going to buy the SS4 pro version at full price but didn't get around to it....today it's half price
just don't get it....so I bought it at $24.99
Been using version 3 pro for a few years now on my ipod and have now bought an ipad.
I hope this and Argo Navis will be all I need for a while to come.