The Web App shows the current data that Navionics has.
Those that participate in the Sonar Charts program can view that to see what changes were made using their sonar logs before they update their map card.
The Mobile App has the same maps. Android or iOS
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1