Updates & Downloads

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GPSMAP 66 (WebUpdater) software version 3.40

as of September 26, 2019

Use Garmin Express to install this file.

(18.77 MB)

View system requirements

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Change History

Changes made from version 3.10 to 3.40:

• Fixed issue where spot soundings were permanently disabled
• Fixed possible issue on the map where we would list use instead of go
• Fixed potential issue where route activity was not saved after changing profiles
• Fixed potential shutdown when Recording Controls is in the page sequence
• Fixed issue where we would delete GPX files on SD cards during Delete All
• Fixed possible issue when leaving Weather page from page loop
• Fixed possible issue with mass storage locking up
• Fixed possible issues with MOB key
• Fixed possible issues with WiFi set up page
• Fixed possible shutdown when using Area Calculation
• Fixed possible shutdown during large Birdseye downloads
• Fixed possible shutdown with changing dashboards
• Fixed timing for flashlight SOS morse code
• Added ability to hide/show the dashboard on the map
• Added Geocaching options to main map page
• Improved altitude accuracy in Expedition Mode
• Improved altitude accuracy with auto calibration
• Updated magnetic compass deviation

Changes made from version 3.00 to 3.10:

• Added ability to view upcoming turns in active route
• Added support for remotely launching Connect IQ apps
• Added additional Connect IQ cryptography support (KEY_PAIR_ELLIPTIC_CURVE_SECP224R1 and KEY_PAIR_ELLIPTIC_CURVE_SECP256R1)
• Added ability to select from multiple found ANT/BLE sensors when searching for one
• Added support for the Swiss grid CH-1903+ position format
• Fixed issue with custom maps on SD cards
• Fixed issue with calorie data field when using a heart rate monitor
• Fixed issue with coordinate entry in some position formats
• Fixed issue with proximity alerts of points loaded via POI loader
• Fixed potential issue when stopping navigation when viewing the active route directions
• Fixed issue that could occur after moving a waypoint
• Improved activity data on Garmin Connect

Changes made from version 2.90 to 3.00:

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

Changes made from version 2.50 to 2.80:

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

Changes made from version 2.10 to 2.50:

• Added support for Connect IQ 3.0
• Added support for SK 42 grid system
• Fixed issue on satellite page and empty lists
• Fixed issue with Connect IQ tones
• Fixed issue with Bluetooth setup from weather or geocaching
• Fixed issue with short address numbers
• Fixed issue with total ascent in saved track
• Fixed issue when ending track navigation
• Fixed issues with map page
• Fixed issue with cancel option on power on settings clear
• Fixed issue where geocache filters weren't being applied
• Fixed issue on confirmation prompts
• Fixed issue with temperature data field text
• Fixed issue with custom map dashboards on stop navigation
• Fixed issue routing to next stage geocache
• Fixed issue where maps would load on every powerup
• Fixed issue when accessing waypoint averaging from page ribbon
• Fixed issue where some highway and freeway map labels were being cut off
• Fixed issue causing weather map UI slowness

System requirements

1. IBM-compatible PC running Windows 2000 or later operating system and an available USB port.

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