OpenCPN shows only a black background with basic outlines, no detailed charts.
I right-clicked the CM93 archive and selected Extract All . "Where to?" the prompt asked. This was the tricky part. The CM93 charts were finicky. They didn't like being moved once installed. They required a permanent home. I created a folder directly on the C: drive, naming it simply: C:\Charts\CM93 .
Click to allow OpenCPN to index the new charts. Click OK . Step 5: Verify Coverage Zoom into a known area on the map. cm93 v2 charts download install
For educational and archival purposes, the general steps for installing CM93 v2 in OpenCPN (the most common host) are as follows. Note: This assumes you have legally obtained the files, e.g., from a legitimate old purchase or backup.
The Chart Downloader plugin in OpenCPN provides an alternative to CM93 v2. This plugin simplifies the process of downloading free, up-to-date official ENC charts from hydrographic authorities around the world, making it an excellent option for users who want regularly updated data without relying on aging CM93 datasets. OpenCPN shows only a black background with basic
Today, CM93 v2 is no longer manufactured or officially supported by C-Map. The format has been discontinued in favor of newer products. However, older chart sets continue to circulate among the sailing community. Some of these are original copies that have been shared, while others are partial datasets assembled from various sources.
If the charts are installed correctly, you will see detailed vector data. This was the tricky part
This guide shows how to obtain and install CM93 v2 vector charts for OpenCPN (or other compatible navigation software) on Windows, macOS, and Linux.
Official Electronic Navigational Charts (ENCs) are produced by national hydrographic offices and conform to the IHO S-57 (and now S-100/S-101) standards. These are the charts used in commercial shipping and certified ECDIS (Electronic Chart Display and Information Systems). CM93 v2, by contrast, is a proprietary format originally intended for recreational and commercial navigation systems, but it does not carry the same official certification status.
: While Open Nautical Charts on SourceForge is a common destination, verify that the download is specifically the CM93 v2 database and not generic raster files. How to Install CM93 v2 Charts in OpenCPN