.map file: how to open it on Windows
1 Windows app registers the .map extension. Install one of them to open the file with a double-click.
About the format
Format data: freedesktop.org shared-mime-info and PRONOM (The National Archives, UK).
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GPXSeeGPXSee is a Qt-based GPS log file viewer and analyzer that supports all common GPS log file formats.
Related guide: Change the default app for a file type in Windows