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Updates & Downloads

GPSMAP 66 software version 5.00 Beta

as of October 29, 2020

Download (17.74 MB)

View installation instructions and system requirements


Change History

Changes made from version 4.90 to 5.00:

Installation Instructions

  1. Download and unzip
  2. Place the gupdate.gcd file, found in the file folder System Software, into the \GARMIN folder of the device.
  3. Disconnect from your computer and proceed through the update.
  4. If you would like to revert to the last public release software, drop the gupdate.gcd file found in the SystemSoftware_Backdate_xxx folder, into the \GARMIN folder of the device.
  5. NOTE: If you revert to an older version of software, all of your settings will be reset to defaults and data may be lost.

System requirements

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