5 min heat query

[Monkeysmate]

He's my latest stupid question...

in heats, when does my "personal" 5 mins start?

Does it start when the computer calls my number?
Or does it start when I cross the loop?

The reason I ask is, you quite often see cars going in the wrong order by accident, and i wonder whether if they go before they're called, do they miss a lap? or are they registered as DNS?

I'm just wondering how keen off the line one needs to be when your number is called...

Any how much i need to push my 5 year old only to go when his number is called (which is not as easy as it sounds when you're 5...)

Thank you