But you should wait for me to tell you if it's really efficient... I think it will work perfectly when the PDA is trigged by the horn button, but I don't know if the magnetical sensor I bought is good enough to detect the magnetical band in the track. I may need to find another one... but some cheap laptimers are for sale on Ebay ( http://cgi.ebay.co.uk/ws/eBayISAPI.d...sPageName=WDVW ), so if needed I'll contact the guy to know what kind of sensor could suit and if he could provide me one...