: Depending on the format of the downloaded charts, you may need to follow specific instructions to integrate them into your preferred software or platform. This could involve importing data files or simply copying chart templates into a designated folder.
A full dataset typically includes approximately 144 subdirectories, each covering a 40° x 40° geographical area.
Originally developed by C-MAP in 1993 for commercial shipping fleets and professional mariners, the CM-93 database was designed to comply with early international vector data standards. The database is split into two major eras: Installing Charts - OpenCPN
In OpenCPN, adjust your vector chart display settings to show "All Details" and ensure your shallow depth contours are set conservatively to account for any unexpected shoaling.
This comprehensive guide covers what CM93 v2 charts are, how they function, where to find them, and how to configure them for your onboard chartplotter system. What Are CM93 v2 Charts? cm93 v2 charts download
Electronic charts have transformed marine navigation from a labor-intensive chore into a real-time, high-precision science. Among the various formats available to sailors, cruisers, and maritime enthusiasts, hold a legendary status.
A key detail when working with CM93 v2 files is the " .EXD " file. This file is essential. The date in its filename (e.g., 20110803.EXD ) indicates the edition of the entire chart set. If the .EXD file is missing or corrupted, OpenCPN (and other software) will not load the charts correctly. It acts as a master index and authenticity marker for the database.
Given the safety risks of navigating with outdated data and the ethical issues surrounding unauthorized downloads, modern mariners are strongly encouraged to utilize legitimate, up-to-date alternatives. Many of these options integrate seamlessly with OpenCPN and modern mobile apps. 1. NOAA NOAA Custom Charts (USA Waters)
C-Map still provides charts, though their modern formats (C-MAP MAX, REVEAL) require a compatible chartplotter. You cannot legally update or download old CM93 v2 files from them. : Depending on the format of the downloaded
The foghorn blew twice. Somewhere, a ship signaled its own lonely insistence. Kai plotted a route that threaded between a spit that the ENC missed and a rock that the CM93 v2 insisted was there. He annotated his own note into the map: “Verified by sonar 10 Apr 2026—depth 3.1m. Safe at half tide.” The file saved locally, a new stitch in the quilt.
If you sail in United States waters, the National Oceanic and Atmospheric Administration (NOAA) provides its complete catalog of Electronic Navigational Charts (ENCs) for . These can be downloaded directly through OpenCPN’s built-in chart downloader plugin. 3. OpenSeaMap
If you're still having trouble finding or downloading CM93 v2 charts, consider providing more details about your specific needs (like the software you're using) to narrow down the search.
A complete set provides worldwide coverage in a single database. Originally developed by C-MAP in 1993 for commercial
Unlike raster charts (digital scans of paper charts), vector charts represent geographic data as mathematically defined objects—coastlines, buoys, depth contours, and other features are stored as discrete, scalable elements. This allows for features like "zoom without pixelation," object-specific clicking for detailed information, and selective display of data layers.
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They work natively with OpenCPN on Windows, Mac, and Linux.