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Firmware: V3.00 - V2.80 - V2.50

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 2.80 to 3.00:

  1. Added support for G3 Marine Cartography.
  2. Added TracBack to active track map review menu.
  3. Fixed possible issue with ascent/descent stats during Expedition Mode.
  4. Fixed possible issue on system resets.
  5. Fixed possible issue when routing to photos.
  6. Fixed possible issue when stopping navigation.
  7. Fixed possible issue when downloading Geocache Live lists.
  8. Fixed possible issue with track save portion page.
  9. Fixed possible issue on photo viewer when there are no photos.
  10. Fixed smart notifications after new pairing.
  11. Fixed possible issue with large Birdseye downloads.
  12. Fixed issue where ghost waypoints were appearing in Waypoint Manager.
  13. Fixed Chirp icon missing from the Geocache Dashboard.
  14. Improved CIQ app support.
  15. Improved photo viewer menu title to be consistent across platform.
  16. Improved download speeds of larger Birdseye Direct images.
  17. Moved activity type (once resided in Fitness) into recording setup.

Firmware Upgrade V3.00 (Please use Web-Updater to install the latest firmware)

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Changes made from version 2.50 to 2.80:

  1. Fixed possible issue when syncing with Garmin Explore App.
  2. Fixed possible issue when saving or deleting waypoints.
  3. Fixed possible issue with RINEX data.

Firmware Upgrade V2.80 (Please use Web-Updater to install the latest firmware)

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Changes made from version 2.10 to 2.50:

  1. Added support for Connect IQ 3.0.
  2. Added support for SK 42 grid system.
  3. Fixed issue on satellite page and empty lists.
  4. Fixed issue with Connect IQ tones.
  5. Fixed issue with Bluetooth setup from weather or geocaching.
  6. Fixed issue with short address numbers.
  7. Fixed issue with total ascent in saved track.
  8. Fixed issue when ending track navigation.
  9. Fixed issues with map page.
  10. Fixed issue with cancel option on power on settings clear.
  11. Fixed issue where geocache filters weren't being applied.
  12. Fixed issue on confirmation prompts.
  13. Fixed issue with temperature data field text.
  14. Fixed issue with custom map dashboards on stop navigation.
  15. Fixed issue routing to next stage geocache.
  16. Fixed issue where maps would load on every power-up.
  17. Fixed issue when accessing waypoint averaging from page ribbon.
  18. Fixed issue where some highway and freeway map labels were being cut off.
  19. Fixed issue causing weather map UI slowness.

Firmware Upgrade V2.50 (Please use Web-Updater to install the latest firmware)

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GARMIN GPSMAP 66s GARMIN GPSMAP 66st Rugged hand held GPS devices with large color display, integrated base map, auto-routing, slot for uSD memory card, USB interface, electronic compass, barometrical altimeter, WiFi and support for wireless communication with compatible devices. The GPSMAP 66st comes furthermore with the pre-installed topographic map TopoActive Europe. Both models support the US GPS, the Russian GLONASS and the european GALILEO satellites, see detailed description.

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