That's not something which can be done with absolute certainty, I think.
Even with something like remote viewing, psychics who [are later found to have] successfully track [ed] a missing child see mere clues, basically, and rarely full big pictures able to pinpoint a location.
It's this sort of ambiguity which tends to make skeptics disbelieve, because saying the child is in a wooded place beneath the hollow of a large tree "could be anywhere," they say, especially after the child is located in the forest, having take shelter beneath the hollow of a large tree. There's simply not enough good information to get the desired result.
That said, you could also try such things as pendulum divination over a map or other representations of places. There are many other methods as well, but I'll let others exhaust that list.
However, it must be kept in mind that without absolute confirmation, any results of divining, scrying, whatever, for someone's location remain pure conjecture at best.
And so, I wish you luck in your endeavor.
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