Manual Intervals

Hi,

I would like the ability to run while starting manual intervals. So, I start a run, which records the entire length of my training session, but at any time I can start an interval, stop it, and start a new one. During an interval the watch will display the interval status only, i.e. time, distance and elevation.

I would like this because predefined intervals don't always work out with the terrain I'm on, and if I'm running laps on a track, the GPS isn't accurate enough to match the length of a track.

I can't work out how to do this. I can select an interval run and click to make it jump to the next interval but that still doesn't give me the freedom I want. Any suggestions appreciated.

Thanks.