USGS topo quad index; orange dots for 1:24K, purple for 1:100K, cyan for 1:250K. Clicking on a dot brings up a pop-up balloon with the name of a quad, and a direct link to the GeoPDF for that quad at the USGS store. Note that GeoPDF quads are not currently available ...
but let’s call it what it is —MOAGU is the mother of all Garmin utilities. What Leszek has created is a utility that will place a USGS topo map on your Garmin GPS. Actually, it will put any scanned, georeferenced