I have copied this file into the Garmin folder on an SD card and loaded it on my GPSMAP 546s. Although the unit indicates the Brownsville - Key Largo supplemental maps have loaded and "System Information" indicates the VUS515L maps are loaded, I can't see any difference from the maps that are preloaded on the unit. There is no Satellite imagery nor a menu option to activate such imagery. Also there are no aerial photos. Is there some other
process I need to perform on this file before loading it to the SD Card?