Garmin GPSMAP 66s / 66st User Manual You can download the user manual for the Garmin GPSMAP 66 series in PDF format here. Garmin Explore Smartphone App for GPSMAP 66s / 66st Download the companion smartphone app “Garmin EXPLORE” for the GPSMAP 66 series at the Apple App Store or Google Play Store. Garmin Explore […]