POLAR V's CATSEYE

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I just got my POLAR 720 yesterday and am still working it all out.

Before I stop using my old CATSEYE speedo, I was wondering if I can use both of them together for a while till I am confident with the POLAR.

Can I use the same magnet?

Should I use both magnets and position them away from each other so there is no double readings?

Will the signals from the sensors be readable by both monitors and cause problems?

The CATSEYE has a total distance reading which I like to keep on record, As far as I can see the POLAR doesn't have this.
My guess is that the total distance may be recorded on the PC when you upload each time...

Anyway, if anybody can give some short simple answers or point me in the right direction .... it would be appreciated.

I'm sure I'll figure it all out in a few days...