CM93 v2 works with several navigation programs (because the file format was reverse-engineered):

| Software | Compatibility | |----------|---------------| | OpenCPN (free) | Excellent – built-in CM93 support | | SeaClear | Basic – needs conversion | | qNav | Partial | | MaxSea (old versions) | Native but requires license key | | SAS.Planet | Via plugin |

OpenCPN is the most common choice. After downloading the CM93 folder, you point OpenCPN’s chart manager to that folder – it automatically reads the tiles.

CM93 v2 (also known as C-Map CM-93/2) is a widely used vector chart format for electronic chart systems (ECS) and certain electronic chart display and information systems (ECDIS). This report outlines the standard methods for downloading or obtaining CM93 v2 charts, highlights the difference between authorized and unauthorized sources, and provides technical guidance for legitimate acquisition.

Assuming you have acquired a legitimate (or legacy) copy of the CM93 v2 folder, here is the standard installation process for OpenCPN (the most common compatible software):

o-charts offers professionally maintained vector charts for OpenCPN based on official hydrographic data. A full world map costs around €60–€100 per year. These are legal, updated regularly, and directly integrate with OpenCPN.

CM93 v2 charts (C-Map 93 Edition 2) are a legacy set of global electronic vector nautical charts. While widely used for their worldwide coverage, their reliance on outdated data makes them a controversial choice for primary navigation in 2026. Core Review: CM93 v2 Charts Reliability & Accuracy

. Most CM93 v2 datasets are extremely old, with major updates ending around 2011–2015. Users report significant detail gaps in areas like Mexico and Southeast Asia, where even dated charts have seen detail removed or relocated. Compatibility Excellent for OpenCPN . These charts are natively supported by

, the popular open-source navigation software. Note that Version 3 (CM93 v3) is not compatible with OpenCPN.

. One of the few ways to get a complete global vector chart set in a single directory. Legal Status Grey Market/Pirated

. CM93 v2 charts are no longer sold to the general public by C-Map. Most "free downloads" found on cruising forums or peer-to-peer sites are technically pirated. Pros and Cons Installing Charts - OpenCPN

In the world of digital marine navigation, few chart formats have achieved the legendary status of CM93. For decades, these charts have been the standard for cruisers, sailors, and commercial skippers using navigation software like OpenCPN.

If you are looking for information on CM93 v2 charts download, this guide explains what these charts are, why they remain popular, and the critical legal and technical considerations you must know before using them.

Given the aging format, consider these official alternatives:

| Alternative | Format | Advantages | |-------------|--------|-------------| | C-MAP Reveal X | Vector + satellite overlay | Regular updates, better detail | | Navico’s C-MAP Embark | App-based | Cloud updates, mobile integration | | Official ENCs (S-57/S-63) | S-63 encrypted | SOLAS-compliant, free for some regions | | OpenStreetMap-based charts (OSM) | Raster/Vector | Free but not official |

For trip planning and overview on a laptop in a dry cabin? Possibly, as a backup to paper charts and official ENC.

For primary navigation? Absolutely not. Many marinas have dredged channels, new breakwaters exist, and depths have shifted. Relying on 2005-era CM93 data could easily run you aground.