I use I Sailor and have used it on a Android Tablet for about two years. Last year I "acquired" a new Ipad that did not have cellular so no GPS. I bought a Bluetooth GPS transmitter and it hooks up perfectly every time. I really like (this is a first) the operating system of ISailor in IOS way more than Android. The GPS transmitter can be bought for under $100. I bought a higher capacity one that will connect up to 5 components and logs. Interestingly I researched it in pilot forums where pilots are using Ipads for charting in planes with the same GPS transmitter.