OnX, Basemap, Google Earth. The limitation will be the accuracy of your phone’s GPS. IME, any marked position with a phone will be within about 25-feet compared to survey grade GPS. Depending on how that error stacks, you could be off by 15 or 20 yards, which would make a difference at a mile.
A quality LRF will likely have a smaller error potential.
If the bean field is yours, and you’re serious, contact a local land surveyor. Depending on where you live, it may only be a few hundred dollars for a surveyor to set hub & tack or lathe at 100 yard intervals. You could pound rebar after the fact to save on cost. You’d then have set distances down to the millimeter. Just a thought.