If you find a genuine, un-corrupted v3.1 card at a fair price and own a compatible plotter, grab it. It is a reliable piece of maritime history that will get you home safely. Just be sure to carry a paper chart as a backup and update your smartphone with a modern navigation app for the latest harbor layouts.
Navionics currently operates primarily under the subscription model. This gives users access to daily updates, sonar imagery layers, and community edits. However, prior to the dominance of the "Plus" system, Navionics sold physical microSD cards pre-loaded with static, high-definition data. These "Gold," "Silver," and "Platinum+" cards were the gold standard. Marine Europe HD v3.1 -Navionics-
Navigate to your chart settings. Ensure the plotter is reading the Navionics card, not the internal base map. Select "Navionics Marine Europe" as the active cartography. If you find a genuine, un-corrupted v3