Is it my garmin that puts the map into Topo or is satellites already part of TOPO's program? If so how do I get updated satellites?
GPS Satellites and aerial imagery are two (mostly) unrelated things.
Your Garmin picks up satellite
signals that it interprets to figure out a location on the face of the earth. There is no
imagery involved.
TopoFusion (the name of the excellent product that this site is dedicated to) takes this position data from your GPSr and overlays it on
imagery that was previously created as maps or aerial photos (mostly taken from aircraft) and is accessible in various locations on the web as stored images. There is no "eye in the sky" providing "real time" images like you might expect to get from a weather satellite. So until that exists and is accessible to the general public (which it undoubtedly will be at
some time, but don't hold your breath) all imagery will lag behind what may actually exist on the ground, often by many years.
But you can create your own maps or mark features with waypoints and tracks.
Just thought I'd throw in my 2 cents.
KF