Updates & Downloads

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

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

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