The dataset typically comes as a folder named CM93_2012 or similar, containing many subfolders (e.g., 00300000, 00400000) and an CM93Dictionary.xml file. A legitimate source might be an old CD-ROM or a second-hand chart plotter's SD card.
| Problem | Likely cause | Fix | |---------|--------------|-----| | No charts shown | Wrong folder selected | Ensure folder contains .DAT files | | Black or missing areas | Corrupt or incomplete set | Re-download another source | | Red X on chart | Chart cell not licensed | Use Chart Files tab → Force Unlock All | | Very slow zooming | SENC rebuild needed | Delete ~/.opencpn/SENC/ folder (Linux/macOS) or C:\ProgramData\opencpn\SENC (Windows) |
Downloading and installing is a rite of passage for the modern cruiser. It provides a free, globally consistent vector chart base that still beats many commercial offerings for offshore passage planning.
Did this guide help? Share it with a cruiser who’s still squinting at gray squares on OpenCPN. And if you know where to find the rare “CM93 v2 + 2018 cell updates” that float around certain Telegram groups – no you don’t. 😉 cm93 v2 charts download install
Even with proper installation, you may encounter problems. Here are solutions to the most frequent issues.
: Search trusted maritime forums (such as Cruisers Forum) or digital archives for a verified CM93 v2 repository.
or specialized cruising sites—to find a version like the "CM93 2015" edition. The dataset typically comes as a folder named
Create a dedicated folder on your main drive (e.g., C:\Charts\ or /home/user/Charts/ ).
Before linking the charts to your navigation software, organize the files properly on your computer to ensure fast loading speeds and easy backups. Recommended Folder Layout
For safe and legal navigation, consider using the in OpenCPN to access official hydrographic charts——many of which are completely free. This approach keeps you compliant while ensuring your vessel and crew have reliable information for every voyage. It provides a free, globally consistent vector chart
He watched the progress bar as 1.7 GB of data—containing 144 folders with cryptic 8-digit names—streamed onto his drive. Once the download finished, he used a tool like to extract the folder, revealing the telltale that acted as the heartbeat of the dataset. Setting the Course: Installing in OpenCPN With the data ready, Elias launched
Input your vessel’s specific draft requirements to color-code shallow areas accurately:
Click Add Directory , navigate to your CM93 folder, and select it.
