Macaster the "mark" function is for if 2 or more skiers are buried, you'd locate one, put a flag over it and press mark then the box will ignore that signal and look for others,
yes movement will drive any box nuts.
here's a 7 foot one with an ortovox transmitter and barryvox box like yours, dead on the dog(you need a good dog too, with any system!)
true you def need a good dog like mine ha
a mate of mine is looking one of them sets your doing he has no way of paying by paypal so if you could pm were to send the money
if ther any left
thanks macster