Topo1a.7z -

These tutorials provide step-by-step guidance on extracting map archives and installing them onto your GPS device: How to Import TOPO to a Garmin GPS YouTube · ExpertVillage Leaf Group

: The .7z extension indicates a high-ratio compressed archive created with 7-Zip . You must extract this file to access the map data within. TOPO1a.7z

.img files are intended for direct placement into the /Garmin folder on a GPS device's micro SD card. TOPO1a.7z