Navionics apps for iPad maps have disappeared from iTunes store. Navionics confirmed by email that they have been withdrawn "temporarely". No explanation given or indication of date when they will be back.
In order to supply you with the best user experience possible, Marine Apps are temporarily unavailable on iTunes for maintenance and enhancements. The newest version will be available by the end of April. Of course, all prior versions are working as usual but updates will be unavailable until the new version is released. Please contact firstname.lastname@example.org with any questions. Thank you for your continued support.