IPad Navionics works using the internal GPS, so is not reliant on the mobile network.

I used mine for a trip from Sydney to Lake Macquarie up to 6 nm offshore and I was perfectly fine.

Michael

Thanks for that, I'll definitely give it a go and report back.

I've used iphone navionics up to 10nm offhore (WA & Qld) - Just for refernce, it works fine. Iphones - Even in cases - are not particualrly waterproof or robust, so if you do venture far from the coast, i would recomend you use a purpose built marine gps / plotter, and keep the iphione / ipad just for reference. They are fantastic when you are on land for dreaming / plotting your next ocean voyage

Poods

I did a delivery trip to Adelaide from Port Fairy recently and the diesel self destructed at about the half way point. We missed our weather window and sailed into an unfamiliar harbour in fifty knots with no motor, and no electronics bar the i phone and the gps ap.Fortunately, it gave us the layout of the marina, as we were doing 10 knots under bare poles entering the marina at 5am . At the least, the i phone was a great backup. By the way we did get in without wiping out either the marina or ourselves. Very nice bottle of rum for breakfast after we pulled that one off.