I just downloaded the latest map files on my 3400 "non S" unit. I formatted the 2gb card prior to uploading. for the past two map cycles, the lubber line stats from some point ( several miles) ahead of the aircraft symbol. This had not been the case in the past. I usually leave it on 19 mile scale. Sometimes the aircraft has to fly many miles to the start of the magenta course line on the map page.

Also, on my 4500, I use the left knob for only heading and course. I usually leave it in heading, but lately on start up, it defaults to Course. Is this a problem with the keep alive battery?