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Firmware: V4.90 - V3.80 - V3.30 - V2.90 - V2.80 - V2.70

The following lists of changes are based on information provided by GARMIN. Changes or improvements which we consider important or especially useful are shown highlighted.

To view the current firmware version, complete the following steps:

  1. Turn on the GPS.
  2. Press the MENU key twice.
  3. "Setup" is now highlighted, press the ENTER key.
  4. "System" is now highlighted, press "up" and "right". "About" should now be highlighted - if not, navigate through the Setup until About is highlighted.
  5. Press the ENTER key.
  6. The system will display the firmware version at the first line ("Software Version") and the unit ID on the second line, followed by various other information.
  7. Press the QUIT key to return to the previous page.

Each upgrade replaces the complete firmware in the GPS, which means you need to install only the version you wish to apply. There is no need to install any previous versions.


Changes made from version 3.80 to 4.90:

  1. Added support for creating courses. Courses can be navigated point to point like a track, or using map data like a route.
  2. Added support for syncing courses with Garmin Explore. Requires updated Garmin Explore app.
  3. Added ability to convert routes and tracks to courses.
  4. Added ability to pair to Garmin Explore without first pairing to Garmin Connect Mobile. Requires updated Garmin Explore app.
  5. Added option to search for POIs near a selected city.
  6. Added on course and off course alerts to track navigation.
  7. Added support for Connect IQ 3.1.
  8. Improved status bar to show paired sensors instead of only enabled sensors.
  9. Improved bluetooth device names in sensor setup.
  10. Fixed possible issues with live geocache lists.
  11. Fixed possible issues returning to the adventure review map from another page.
  12. Fixed time data when copying tracks in reverse.
  13. Fixed issue where route list would not update after route was deleted.
  14. Fixed issue with keyboard language not persisting through power cycles.
  15. Fixed an issue deleting adventures that contain routes.
  16. Fixed possible issue with elapsed time when recording is paused.
  17. Fixed possible shutdown selecting Current Activity from the Recorded Activities app.
  18. Fixed issue where messages would appear during power-down.
  19. Fixed pressure labels for hectopascals.
  20. Fixed possible issue with missing track stats in GPX files.
  21. Fixed issue selecting the first point on the active route page.
  22. Fixed possible shutdown on keyboard page.
  23. Fixed display issue on photo viewer page.
  24. Fixed recording with expedition mode when auto-start is off.
  25. Fixed issue where archived tracks could not be deleted.
  26. Fixed issue with LiveTrack data not being sent correctly.

Firmware Upgrade V4.90 (Connect your device with your Wi-Fi or use GARMIN Express or Web-Updater to install the latest firmware)

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Changes made from version 3.30 to 3.80:

  1. Fixed possible issues with Explore sync.
  2. Fixed possible issue with incorrect track distances when using expedition mode.
  3. Fixed issue where the text and keyboard languages could get out of sync.
  4. Fixed possible invalid track GPX files after changing color.
  5. Fixed possible issue with inReach remote message notifications.
  6. Fixed possible missing band labels on satellite page.
  7. Fixed Track color issue.
  8. Fixed possible issue when viewing the Current Activity
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Changes made from version 2.90 to 3.30:

  1. Fixed possible shutdown when sending a Quick Text from inReach Remote.
  2. Fixed issue with weather map not defaulting to active weather position.
  3. Fixed possible issues with items missing during Explore Sync.
  4. Fixed an issue where certain submenus could be draws off screen.
  5. Fixed issue setting custom waypoint offsets using filename.
  6. Fixed possible issues that caused the main menu to draw over the current page.
  7. Fixed possible shutdown related to BirdsEye direct downloads.
  8. Fixed possible issue getting stuck on a page after powerup.
  9. Fixed possible issues with postal code searches.
  10. Fixed issue where proximity alerts would only alert once.
  11. Fixed missing alerts from points loaded using POI loader tool.
  12. Fixed adding hidden SSID networks.
  13. Fixed possible issues with time restricted speed limits.
  14. Fixed navigation to a geocache to always continue until ended by user.
  15. Fixed geocache file list to wrap.
  16. Fixed some issues with geocache photos.
  17. Fixed issue where certain pages could incorrectly appear to have tabs.
  18. Fixed issue where fit activities could be missing start time data.
  19. Fixed issue where bearing line would not appear on map in CDI compass mode.
  20. Improved recent finds list to include navigation started from the map.
  21. Improved functionality of navigation features with Explore.
  22. Improved round trip routing setup experience.
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Changes made from version 2.80 to 2.90:

  1. Fixed issue with geocache proximity alarm slowing down start up times.
  2. Fixed issue that could occur when clearing geocaching live data while navigating to a geocache.
  3. Added support for starting navigation from the Explore app.
  4. Added Rinex logging support.
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Changes made from version 2.70 to 2.80:

  1. GPS Performance Improvements.
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Version 2.70:

  1. Initial Release.
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GARMIN GPSMAP 66s GARMIN GPSMAP 66st GARMIN GPSMAP 66sr GARMIN GPSMAP 66i Rugged hand held GPS devices with large color display, integrated base map, auto-routing, slot for uSD memory card, high-speed USB interface, electronic compass, barometrical altimeter, support for WiFi and wireless communication with compatible devices. The GPSMAP 66st/66sr/66i come furthermore with pre-installed maps TopoActive Europe. All models support the U.S. GPS and the European GALILEO satellites, the models GPSMAP 66s and 66st support also the Russian GLONASS satellites. The model GPSMAP 66sr supports GPS, GLONASS and GALILEO simultaneously (Multi-Band). The GPSMAP 66i is capable of sending and receiving short messages and triggering interactive emergency calls to GEOS via Iridium satellites from every location worldwide without the need of a mobile network (inReach subscription required), see detailed description.

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