Lots clean, but several hated it's "obscurity". Well, if you can come up with 48 route cards without diverting occasionally to non-mapping instructions you can run the next series!
The distances were the length of long jumps. In a decathlon you gets point for the distance jumped. Look up the points at, say, http://www.sportcalculators.com/decathlon-calculator, and you ended up with nice numbers for spot heights: 75, 64, 73, 82, 97, 112, 96, 111, 141, 143, 193, 127, SSW118, 77, 85, 105, 142, 125, 132, 187, 178, 191
Time penalties were scrubbed at TC3 because of Google's inconsistency of route round a triangle.
Hints: 1) Long Jump 2) Decathlon 3) Number of Decathlon Points for the Long Jump for the given lengths.
Best performance: Andy Elcomb 56:16.