CMR File

What are CMR files and how to open them

Are you having problems opening a CMR file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your CMR files.

What is a CMR file?

A .CMR file is a SeeYou Raster Map file.

SeeYou Raster Map format stores high-detail map images together with their geospatial calibration so SeeYou can display them correctly over geographic coordinates. It is used to add scanned map sheets, satellite photos, or sectional charts to the SeeYou software so that pilots can overlay their flight paths, airspaces, and waypoints over realistic map backgrounds. The main use is in flight planning, debriefing, and navigation visualization in SeeYou.

Files are produced by Naviter's SeeYou programs (for desktop or mobile) when exporting or downloading map resources in the proprietary raster format. They are read and displayed by SeeYou's "Raster Maps" tool. Once a CMR map is calibrated and loaded, no further setup is required: SeeYou recognizes its embedded calibration and places it appropriately. CMR maps are shared as single files.

A CMR Raster Map can include various raster sources such as sectional chart maps (for example, U.S. Sectionals), satellite images, or topographic scans. These maps usually correspond to fixed geographic regions (e.g. a state or chart area), and support multiple zoom levels to maintain good resolution when zoomed in.

Files begin with the ASCII signature CUMAP at offset zero.

How to open CMR files

Important: Different programs may use files with the CMR file extension for different purposes, so unless you are sure which format your CMR file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested four different CMR openers which you will find listed below.

Last updated: August 31, 2026

Various apps that use files with this extension

These apps are known to open certain types of CMR files. Remember, different programs may use CMR files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CMR file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.