But the iPad and the Garmin Glo finally cleared and worked fine. IN my case, our iPad gets used almost constantly streaming movies on line, providing music through Pandora, news, it's used more than any computer at home.
I'm not surprised having problems using the Garmin nav. app today, first sail. It's likely plugged up with too much stuff.
It's not reliable enough to depend on solely but I love it as another CP. I was amazed to watch my course change as I lowered my centerboard for the first time today. 12 degrees to windward! A record.
I think these problems aren't likely to last as new generations of tablets and charting apps evolve. I may look into the newer iPad minis for the boat. Huge screen for a CP on my boat.