Odometre

I have the garmin edge 500 and absolutely love it but it lacks total km (unless timer is started)
I quite oftern ride with out starting the timer and leave the data colection for set rides

I have posted a thread on this already but what i am looking for is if there is a second computer i can get that works on the ant fequency and one that counts the total kms with out having to start the timer


Twiggy73