Be careful, this is a low resolution app, meant for phones, not your iPad. I downloaded it since it said for mobile devices, and compatible with iPad, but it really isnt. If you want to use navionics, get the Boating HD app instead. Ive complained to apple, but got no response, even though I spent $100 on the HD app after.
MareAdCaelum about Boating US&Canada, v8.1.1