Do you know anybody with a smartphone? They have free apps you can download that do GPS and mapping. The one I used is off by 10-15 feet, I think thats what the handheld GPS units do, but what made it so helpful was, I could walk to known and visable spots and then look at the mapping part to see where the GPS said I was. Example, I walked to several points in my yard that are visable from the satalite maps: mailbox, corner fence post, single tree in the yard, large rock ect. Then I looked at the map and where it said I was. It was always off but it was off consistantly. One day it said I walked a pattern 12 feet due south of my actual route and thats showed up on the aerial map, the red line showed me walking perfectly south of where I knew I walked. A different day, I was 10 feet NNW of my actual route. My point being, GPS may not be perfectly accurate but if you have mapping available, you can look at a known route like I did and make adjustments.
The app I downloaded also has GPS cordinates that can be entered so it will walk you right to your entered point, in your case if you find the missing cordinates on a survey, you can enter that and walk right to it. I havent tested that yet but if on the day I am looking, I can run a known route, look at the map and if the GPS places me 10 feet south of the actual mark, I can input my cordinates, walk to the point and look 10 feet south of there. Just keep in mind that the GPS will show you off a different direction depending on what and how many satalites it syncs up with so do both in the same day as soon as you can.
I mentioned the smart phones because they are pretty common now days, even if you dont have one, you know somebody that does. Using a smart phone with a free app, to me, sure beats buying another gizmo I will only use once or twice. That and it workes way better than I ever thought it would.
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