Files with sum file extension are used by Garmin GPS devices and navigation apps.

There are 2 other file types using
the SUM file extension!

empty icon.sum - Summary

empty icon.sum - SciLab CAPE-OPEN Unit Operation Unit-operation model file

Detailed description

Software that works with sum file extension

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SUM file - Garmin checksum data

What is sum file? How to open sum files?

File type specification:

Various data file type icon Various data file type

The sum file extension is associated with the Garmin GPS devices and navigation applications for mobile platforms.

The sum file stores checksum (data used to detect errors) for maps and voices.

The default software associated to sum file type:

Garmin Connect icon

Garmin Ltd. logoGarmin Connect  Multiplatform software

Company or developer:
Garmin Ltd.

Garmin Connect is used to help you to focus even more clearly on your fitness and healthy living goals. All the data you rely on is easy to find and access on the app. Plus, you can also upload data from your compatible fitness watch or device to share via our online network, so you can compare times or compete with friends on weekly step or running challenges.

Help how to open:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert:

As far as we know, this .sum file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

List of software applications associated to the .sum file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open sum file, edit sum file, convert sum file, view sum file, play sum file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is ableto perform the specified software action, such as opening, editing or converting sum files.

  • Create sum file
  • Others sum file

Programs that can create sum file - Garmin checksum data

Programs supporting the exension sum on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about Garmin Connect for create sum file action.


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