GPS is great for excavation but can't be used for foundations... unless you want your corners off by 2-6 inches. For 60 gridlines you need a total station... but if it's your first time using it... I would hire surveyors to show you how until you're comfortable with it. May also need a data controller depending on the model. Will most likely mean you'll need a cad software, either autocad, carlson or some other version to edit or create the drawing file and work with your points.
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