Russ,
I just installed one mile of underground tubing in a golf course in Asheville. Same problem, no power at site but we could feed up to 5 AirPods off this one mile line.
The Golf Super wanted a way of tracking the line for future turf improvements and we added a 14 gauge copper wire as Theo said above to be able to detect the location. Using a simple metal detector, it worked great.
Maybe we should add this option to our product line? HMM?
