[Marysecretary]

I don’t know what GPS marking means. How do they do it?

[Theophilus]

I don’t know what GPS marking means. How do they do it? I don’t know what GPS marking means. How do they do it?

They simply enter your address in the device and push a button. The hand held computer then uses GPS signals from numerous satellites overhead to estimate the number of meters on the X, Y and Z axis' from the geocentric center of the earth to the computer and it records those three numbers next to your address. You are "marked" (poor choice of words) inside the computer. Later they can compare the location stored in the hand held computer to a main database to verify that you were visited and counted. The UPS and the FedEx guys do it all the time and probably the meter reader for your utilities too. I use it to find my deer stand in the dark, and then to find my way back to the vehicle when I'm done.

[Ol' Sparky]

I don’t know what GPS marking means. How do they do it?

A GPS location is indicated by the census taker's hand-held computer and he or she marks the spot on a map given to them by the computer.