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I need someone can give me an advice about the catapult gps system I bought a new product then I setup up the settings as a CM Need help on that

What the type of training do u pick in polar watch when u start the game when i choose “running” it shows me the duration as 00:00:00 so my question what is the comfortable “picks” in polar watches for referees

I got new polar vantage M today can i use the gps to tracking my running on the field? Anyone have this model please ..

I’m asking about the best brand for a GPS tracking equipment that have be using by UEFA referees and how much it gonna cost me ..