CM93 v2 (often written as CM93/2 or CM93-version2) is a vector-based electronic nautical chart format originally developed and distributed by C-Map, a company now owned by Jeppesen. Vector charts differ fundamentally from raster charts like paper scans: instead of being a static image, vector charts contain discrete, scalable objects such as depth contours, buoys, channels, and harbor infrastructure that can be zoomed in and out without losing clarity.
Ensure your download wasn't a "partial" set. True global CM93 v2 datasets are roughly 1.2 GB to 1.5 GB in size. If your folder is only a few megabytes, you are missing crucial zoom layers. Summary Checklist Key Detail 1 Download CM93 v2 Verify folder size is ~1.2 GB+ 2 Extract files Move to a dedicated directory like C:\Charts\ 3 Add to OpenCPN Use Options > Charts > Add Directory 4 Rebuild Database Check Force Full Database Rebuild 5 Cross-Reference Always verify with updated, official ENC charts cm93 v2 charts download install
Smaller file sizes, customizable display (layers), zoomable, intelligent objects. CM93 v2 (often written as CM93/2 or CM93-version2)
CM93 v2 (often written as CM93/2 or CM93-version2) is a vector-based electronic nautical chart format originally developed and distributed by C-Map, a company now owned by Jeppesen. Vector charts differ fundamentally from raster charts like paper scans: instead of being a static image, vector charts contain discrete, scalable objects such as depth contours, buoys, channels, and harbor infrastructure that can be zoomed in and out without losing clarity.
Ensure your download wasn't a "partial" set. True global CM93 v2 datasets are roughly 1.2 GB to 1.5 GB in size. If your folder is only a few megabytes, you are missing crucial zoom layers. Summary Checklist Key Detail 1 Download CM93 v2 Verify folder size is ~1.2 GB+ 2 Extract files Move to a dedicated directory like C:\Charts\ 3 Add to OpenCPN Use Options > Charts > Add Directory 4 Rebuild Database Check Force Full Database Rebuild 5 Cross-Reference Always verify with updated, official ENC charts
Smaller file sizes, customizable display (layers), zoomable, intelligent objects.
