Not to come across brash but if one were to read this entire thread, there are several known issues stated. There are several threads on this board and others in regards to waypoint and map sharing on the GPS MAP series. One of the most respected members on this board LWinchester shares an account of his 8600 not sharing with his 1242. He stated he hopes it will be resolved via update. I feel that the GPS MAP lineup is bloated and prone to software issues right now. It amazes me that there are not more compatibility issues which is a testament to the commitment of Garmins Engineers.