Navionics continues to disappoint. $50/yr to use the app is insanity. It appears maps saved for offline use are still viewable for now but everything else is gone unless you subscribe at the ridiculous new rate. Unfortunately I was not aware the change was coming and did not have much saved for offline viewing.
https://www.navionics.com/usa/blog/post/boating-app-price-adjustment
https://www.navionics.com/usa/blog/post/boating-app-price-adjustment