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Use the free trial to verify your local lake or inlet has good SonarChart coverage. Then, buy a used 2023 Navionics SD card on eBay for $40. You get safety without the subscription, and you didn't risk bricking your plotter.

: Even without a subscription, you can still use basic tools like SonarChart™ Live (creating your own real-time bathymetry), night mode, wind forecasts, and distance measurement tools. Navionics Subscription Tiers navionics marine maps free downloads work