Cards labeled strictly "5.3.1" may not be compatible with the latest Garmin software (2024+) that expects ActiveCaptain authentication. Users report that inserting a 5.3.1 card into a new Garmin GPSMAP 9000 series forces a read-only mode, disabling sonar logging.
The 5.3.1 card covers the exclusive economic zones (EEZs) of 21 countries, including Spain, France, Italy, Croatia, Greece, Turkey, Tunisia, and Egypt. It includes inland waterways such as the French Canals du Midi and the Italian Po River delta. Notably, coverage extends to the Black Sea via the Turkish Straits (Bosphorus and Dardanelles). Navionics Mediterranean 5.3.1 Cards
Commercial anglers favor the 5.3.1 for its depth shading features. The card allows the user to set shallow water alarms (e.g., <2m) and color-coded depth ranges (green for 10-20m, red for >50m). However, the lack of real-time relief shading (introduced in v6.0) limits identification of small wrecks. Cards labeled strictly "5
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The card supports a "Fish Eye" 3D view, allowing navigators to visualize underwater terrain. For example, the submerged volcanic vents off Santorini or the submarine canyons of the Ligurian Sea are rendered in pseudo-real-time. It includes inland waterways such as the French
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