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Format

Garmin Flexible and Interoperable Data Transfer File

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Summary

Name
Garmin Flexible and Interoperable Data Transfer File
Identifiers
PUID: fmt/1651
Format type
Text (Unstructured)
Description
A file format developed by Garmin, for the storing and sharing of data from sports and health devices. Data is collected during a sporting activity, stored on the Garmin device, and can then be uploaded to the Garmin Connect web service, and other web applications. The format ensures that any .fit compliant device can interpret data from another .fit compliant device. The format allows users to track and compare data about their physical activities over time.
Note
Specification: https://developer.garmin.com/fit/protocol/
File extensions
fit
Submitted by
Digital Preservation Department / The National Archives
Developed by
Garmin / Garmin
Supported by
Garmin / Garmin

Internal signatures

Garmin Flexible and Interoperable Data Transfer file

Description
BOF Absolute from beginning of file, magic bytes: FIT
Provenance
v.115: Max-offset modified for BOF signature to allow for more exact signature identification. Internally researched. V.121: Amended offset from 9 to 8 and changed signature from 464954 to 2E464954.

Byte sequences

Min Frag Length
Absolute from BOF
Offset
8
Max offset
0
Byte Sequence
2E464954
Endianness
None

Changelog

  • V121

    Release date
    24 September 2025

    • Updated

      Garmin Flexible and Interoperable Data Transfer File: Amended offset from 9 to 8 and changed signature from 464954 to 2E464954. Submitted by Digital Preservation Department, The National Archives (UK).

  • V115

    Release date
    15 November 2023

    • Updated

      Garmin Flexible and Interoperable Data Transfer file: Max-offset modified for the BOF signature to allow for more exact signature identification. Submitted by Digital Preservation Department, The National Archives (UK).

  • V105

    Release date
    29 June 2022

    • Added format

      Garmin Flexible and Interoperable Data Transfer file: Full entry added. Submitted by Digital Preservation Department, The National Archives (UK).

    • Added signature

      Garmin Flexible and Interoperable Data Transfer file: Signature researched and samples provided by Digital Preservation Department, The National Archives (UK).