If you read the reviews in the app store you'll see that I'm not alone and I also left a review and I also sent an email to the company via their conduit. No response. If you have the earlier version of the app DO NOT UPGRADE it. I did and that's where I ended up with the problems. Charts and info disappearing when I had downloaded them in PC and had it all set up. I upgraded the app in Kuna Land and actually tried a digicel sim in the ipad and then charts would disappear, charts couldn't complete the download even though I had downloaded them earlier and of course charts were just plan BAD. I figured once I had a good track I didn't really care about the chart. For a week the program even opened up all black. Wrote the company and no response. Another individual in the app store reported the same issue. Finally after the last upgrade most came back but it always wants to load in charts and stay connected to the network. Navionics has the usual disclaimer in their opening screen. Should have listened.

Like I said, if someone wants to give money away for something that doesn't work up to quality expectations I'll take some.

Ciao