CM93 v2 charts are a legacy global vector chart database widely used by the maritime community, particularly within open-source navigation software. While newer standards like CM93 v3 and S-57/S-63 ENCs have largely replaced them in commercial shipping, CM93 v2 remains a popular "fallback" or planning tool for recreational sailors. What are CM93 v2 Charts?
CM93 v2 charts are a proprietary vector format developed by C-MAP. They are structured as a collection of subdirectories (typically 144 folders) covering the entire globe in 40° x 40° geographical "cells". Key Characteristics:
Vector Format: Unlike raster charts (scanned images), CM93 v2 charts are data-driven, allowing for seamless zooming and the ability to toggle layers like soundings or navigation aids.
Global Coverage: A complete set provides worldwide coverage in a single database.
Legacy Status: Official updates for CM93 v2 largely ended around 2011–2014, making them "obsolete" for primary navigation in modern ECDIS systems. Software Compatibility
The most common reason for seeking a "CM93 v2 charts download" is for use with OpenCPN, a free, open-source Chart Plotter Navigator. CM93 charts 2019 or 2020 for Open CPN › Maritime Forum
If you possess a legitimate copy of CM93 charts ( cm93 v2 charts download
CM93 v2 charts are a legacy set of global marine vector charts originally produced by C-Map. They have become a cornerstone for amateur mariners and cruisers due to their extensive coverage and compatibility with open-source navigation software like ⚓ The Role of CM93 v2 in Modern Navigation
While official Electronic Navigational Charts (ENCs) are the standard for commercial shipping, CM93 v2 remains popular in the sailing community for several reasons: Global Coverage
: They provide a comprehensive, worldwide database of maritime data in a single package. Format Compatibility
: Unlike later versions (v3 and beyond), which use proprietary SENC formats, v2 is easily readable by various navigation platforms. Software Flexibility : These charts are the primary choice for users of and were historically used on mobile apps like Offline Capability
: They allow for full navigation without requiring an active internet connection, which is critical for long-distance ocean crossings. 📂 Identifying Genuine CM93 v2 Files
Because many "updated" versions found online are actually older data with new dates, it is important to verify your files: Directory Structure : A full world set typically contains 144 folders with 8-digit numeric names (e.g., File Extension CM93 v2 charts are a legacy global vector
: The top-level directory must contain an empty file with the extension, such as 20110803.EXD , which indicates the release date. Chart Detail Level : Folders are sub-divided into categories from (world overviews) to (highly detailed harbour plans). ⚠️ Safety and Security Warnings
Users should exercise extreme caution when attempting to download these charts from unofficial sources: Outdated Data : The last official update for CM93 v2 was reportedly in
. They should only be used as a secondary aid to navigation and never as a sole source for entering unfamiliar or hazardous waters. Malware Risks
: Many "free download" links on forums or file-sharing sites are deceptive and may attempt to install malicious software or browser hijackers. Legal & Official Status
: These are "unofficial" charts. For primary navigation, mariners are encouraged to use official S-63 encrypted charts available through authorized providers like o-charts.org
CM93 v2 charts are a legacy format of unencrypted vector nautical charts originally produced by C-MAP. They are highly popular in the cruising community because they provide worldwide coverage and are compatible with open-source navigation software like OpenCPN. Key Insights on CM93 v2 How to Use CM93 Charts in OpenCPN If
Format and Structure: Unlike modern encrypted S57 charts, CM93 v2 uses a unique directory structure with up to 144 folders (named by geographic coordinates) and an identifying .EXD file (e.g., 20110803.EXD).
Compatibility: They are primarily used with OpenCPN, but also work with other software like Locus Map. Note that version 3 (v3) of CM93 is encrypted and generally not supported by open-source tools.
Scale Levels: The data is organized into scales ranging from "Z" (World scale, ~1:3,000,000) down to "G" (Harbor plans, ~1:3,500). The Download Dilemma: Status and Risks
While users often search for "cm93 v2 download," there are critical legal and safety factors to consider: Installing Charts - OpenCPN
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.