[time-nuts] Latitude and longitude question

[Joseph Gray]

Let me first say that I don't know anything about surveying. I have a copy
of the plat survey for my house. On the survey are four sets of coordinates
that resemble lat/long numbers, but obviously aren't. What are these
coordinates and is there any way to calculate a lat/long of a specific point
on my property from these numbers? If so, how accurate could I expect the
result to be? I assume that a professional survey should be highly accurate.

Any pointers to information on doing this would be appreciated.