| Your other replies are interesting, but why not keep it simple.
Mark your A & B point, set your line. Attach your wire to a post and drive your line and unroll the first wire. Pull wire tight. Now you can drive your post pounder beside the wire and there are a few choices. Either spray paint a mark on the front tire and the driver counts how many revolutions or the pounder guy walks 5 paces and then you pound your post.
Every time you start and stop to set a post your guidance will kick out.
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