If your device shows a "GPS SW Version" or "Chipset SW" in the About menu, look for a number beginning with 10R. If it is lower than 6953, this update is for you.
The software version 10.0 (often displayed as Main 10.00) is a significant milestone for the GNS W-series. It introduced enhanced SBAS (Satellite Based Augmentation System) capabilities and updated the internal algorithms for GPS signal processing. The suffix "04" typically indicates a specific build or regional variant (e.g., 10R-04 is often associated with European/Australian/Terrain-enabled variants, while US units often see standard 10.00). garmin 10r-04 6953 update