you can't use Google Earth to map your property other than to give you a general view. You must locate the points on the Earth based on known locations. If your survey is lot, book and tract, or known distance and angles from set points, you need to locate those points compared to the known points. If the survey is Metes and Bounds then you need the Marker points in that map. Examples below:
Metes and Bounds - oldest form. The deed will say something like 210' NW from Farmer Browns old oak tree to the rock at the intersection of Smith and Brown's fields, to the creek, then to the old bluff then back to the beginning point. Without those markers you will have trouble finding the boundaries.
Lot, Book and tract. There will be a survey map of the Land Tract filed in the County offices. Normally there are brass markers on some of the street intersections that you measure from.
Based off Township and section. There will be a marker for your area - typically a mountain top or something like that many miles away a surveyor can see. Then they will use instruments to measure the exact angle in the map to that known point, or another that is known to come off that Baseline and Meridian. Then off that you measure the angle and distance to the next corner. Normally when the property is surveyed the Surveyor marks the corners with a peg, (steel rod in the country is most common). If you borrow a metal detector you may be able to find the rods. Sometimes they will drive a stake in NEAR the rod or peg. The stake you see on construction sites is NEAR the peg but is not the peg.
Modern GPS equipment that Surveyor's use is close but not totally accurate. They usually use it to get them very close to where the peg is. Sometimes, depending on the area there can be local GPS senders that are EXTREMELY accurate. In that case the device they are holding is EXTREMELY accurate because it is going off a couple nearby GPS senders that have been surveyed to be perfectly accurate, instead of satellites. Only the military gets the exact location off satellites. The survey company whose equipment I support has GPS devices on their roof top that they use when surveying locally. These have the accuracy the same as like measuring angles to a known mountain top.
All that said, from your map I would borrow a metal detector and look for the steel rods driven in the corners. If they are gone or someone has monkeyed with them, they you will need to pay for a new survey. Sometimes people just do that anyway because it is not totally unknown that someone has moved them to get more land. Some states have laws that after so many years the position of the moved stakes become the new boundaries. Likewise in some states if you have Metes and Bounds, and a creek moves then that can change the size of the lot.
In some states the Title Company / Escrow Officer walks you along the boundaries when you buy the property and you tie a ribbon or drive a stake every so often to prove they walked you along the boundaries. That can take all day on a large lot. I know this because I worked for years in the Mortgage industry all over the country for years, and it can be different between states. In many states a survey is required every 5 years to do anything with the property - sell, or refinance etc., so you might want to start looking now for a survey company if you plan on doing either and your state requires it. In those states if the rods/pegs are missing then they have to re-survey the whole property rather than just confirm the presence of the rods/stakes from the last survey. Good luck.
