What size is the ball mount on a Garmin GPS and how do I find a compatible mount?
RV 890 / Camper 890 / RV 1090 / Camper 1090 Owner's Manual - Installing the Ball Mount Adapter
APPS2Car Adjustable Vent GPS Mount Screw Nut Compatible With Garmin Nuvi Serie 3.5 to 6 Inch GPS – APPS2Car Mount
Amazon.com: BRCOVAN 1'' Ball to 17mm Ball Adapter Compatible with RAM Mounts B Size 1 Inch Ball Double Socket Arm, Fit for Garmin GPS Mount 17mm Swivel Ball Mounting Pattern : Electronics
Amazon.com: 1Zero Solid GPS Cup Holder Mount for Garmin [Adjustable Arm], Replacement Car Truck Cupholder Ball Mount Compatible with Garmin Nuvi Drivesmart RV Dezl Drive Zumo Driveassist DriveLuxe Navigator : Electronics
RAM® Twist-Lock™ Suction Cup Mount with 17mm Garmin Ball (Drive + More – RAM Mounts