Just remember that the error on a handheld GPS thingy is +/-10' at the best. So even if you know the exact lat/long of your property lines, and are using the same coordinate system on your GPS as on your original survey data (there are, believe it or not, a bunch of different lat/long coordinate systems that all differ from each other slightly) you can still be off by 10' or more. If you're just curious to know about where the boundaries are, no problem. But if you're building a fence or outbuilding, you need to be aware that if you go by the GPS reading, you could end up with your fence/building on your neighbor's property and that can be a mess.
That's why those guys with the orange vests and tripods (survey crews) still have jobs.
i would go down to the building department and check out what you have. Get a copy of the survey and it will tell you how far your property line is from the existing building. All you would have to do is measure it with a tape and you're all set. If what you're doing requires any type of diging (fence/deck/extension/etc..) call miss daisy. They will come and flag all areas where you have electric/gas/water/sprinkler/cable lines burried underground. It will save your ass and its a free service compliements of your local dte energy company.
oh and never use a gps it is very inaccurate for such applications just ask the city building inspector and he'll tell you the same.
very true i have the latest model and it is only accurate within 3 ft. still not good for property lines, as stated earlier you can get a copy of the survay from the city. not to mention if you need it for legal or neighbor issues that is good as gold, and that is what you will have to go by eventually.