Astro Dog Tracking System Owner’s Manual AppendixTransfer tracks as described on page 59.Purchase microSD cards from an electronics supplier orpurchase pre-loaded MapSource detailed map data cardsfrom your Garmin dealer. Go towww.garmin.com/cartography/ for compatibleMapSource products.To install or remove the microSD card:1. Remove the battery compartment cover from the backof the Astro 220.2. Remove the AA batteries.3. Slide the tray cover back to open it, then lift it toremove or insert the microSD card.4. Slide the cover forward to lock it in place.MicroSD card coverAstro 220 with BatteriesRemovedMicroSD cardMicroSD card trayTo transfer Garmin MapSource map data to themicroSD card:Follow the instructions provided with the MapSourcemap data disk.To use the USB Mass Storage Mode:1. Connect the Astro 220 to a computer using the USBcable provided.2. Press MENU > MENU > Advanced > Settings >System > MENU > Mass Storage Mode.