Thanks Guys I have fiddedles some more and found the altatude filter and the smoth check box the more or less fixed what i was seeing :) so now I will fiddle with fine tuning. And Im in the processe of documenting everything I can each time it crashes befor i contact them . the Demo is sposta be version 3.1. I have noted the crash seems to be in mfc42.dll most of the time what ever that is and that dll is one of my system dll's not fron Vue as the file install date on my system is months befor Vue. I know in time it will be figured out :) laters Vel