This is my first handheld GPS. I found a very detailed map here of PA and Followed the loading instructions found on this site. It went like clockwork. I found the segments I wanted to upload, selected them and transferred them to the GPSMAP 78. Files were transferred successfully. The map shows up on the Garmin but I don't see half the details I see in Mapsource or Basecamp. All I see are some rails to trails, bodies of water, county lines and streams. In Mapsource I see roads, streets, elevations etc. Am I missing something? I have tried to upload maps using both...Mapsource and Basecamp and I get the same results. I have set the 78 map setup > advanced map setup > detail to MOST and I still don't see any more details. Can anyone shed some light on this? Thanks.