How Do the Golf Cart GPS Systems Work

I do know how they work:

A reading is taken of the latatude and longitude of a position on the green and recorded. I believe they map the whole green to a degree, then any given day sombody setting up the GPS system for the day has to tell the system where the hole is for that day on the green. The GPS in the cart knows where the cart is, it knows where the hole is, then calculates the distance.

They also record the lat/long. of any other object (trees, lakes, ponds, bunkers) on the course and it works the same way.

I talked to a fellow setting up our course for our new GPS system and said they could set it up each day to get the yardage to the pin, if they wanted to do the work to set it up what way. They put up a grid on the computer screen by foot and click click, it's recorded to the hole, as accurately as they have told it.

Hand held devices work the same way but they have just mapped the front, middle and back of the green.

May actual question is that a friend of mine when into a Roger Dunn golf shop and was told by a salesman that there was something on the flagstick that the hand held device located and calculated the distance from. Another friend told me he thought they worked the same way.

Are there devices that work that way and what are they called if there are any?

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