The charts were typically distributed on CD-ROMs that required an authorization code from C-Map to unlock. Instructions for the official installation process involved using C-Map’s own tools (like the NTPC Selector) and required the presence of a hardware dongle in some cases.
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For serious offshore cruising, paper charts remain the ultimate backup in case of electronic failure. cm93 v2 charts download install
If your navigation is within United States waters, NOAA provides free, regularly updated ENC charts for download via the Chart Downloader plugin.
| Software | Compatibility | Notes | |----------|--------------|-------| | | No (raster only) | Not supported | | qNaval | Partial | Requires conversion | | Transas iSailor | No | Proprietary ENC only | | TimeZero | No | Uses official S-57/S-63 | | Navionics Boating | No | Proprietary format | | Seapilot (Android) | No | |
CM93 v2 is a legacy vector chart format originally developed by C-MAP. Unlike raster charts, which are simply digital scans of paper charts, vector charts store geographical data as mathematical points, lines, and shapes. Key Features of CM93 v2 The charts were typically distributed on CD-ROMs that
Disclaimer: This guide is for informational purposes only. The author and publisher do not endorse or promote the unauthorized distribution of copyrighted material. Always use official, up-to-date charts for navigation and comply with all applicable maritime regulations and laws.
Create a dedicated folder on your computer's hard drive (e.g., C:\Charts\CM93 ).
O-charts are an alternative modern solution for OpenCPN users, providing regularly updated, licensed vector charts at reasonable prices. They are fully compatible with OpenCPN and are frequently recommended as a legitimate alternative to aging CM93 v2 datasets. If your navigation is within United States waters,
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Once installed, charts are converted to a proprietary format. Depending on the number of charts, this conversion process may take a considerable amount of time—even hours. To reduce installation time, charts that are not required need not be converted.
OpenCPN is the most popular open-source software used to read CM93 v2 data. The installation process involves pointing OpenCPN to your chart directory and letting its database engine build a chart outline map. Step-by-Step Installation Launch .