You see the line.
The checkpoints are hidden.
Stealth-O is orienteering with an invisible layer. The map shows you the route - a drawn curve over contours, north lines, terrain. No markers in the field. No checkpoints.
But they're out there. Some stations are yours to hit - in sequence, without gaps. Others are ghost stations: placed near the line to catch anyone who cuts a corner or drifts from the route. Touch a ghost and you take a penalty. Your wristband records every contact automatically. No punching.
After the finish, the system reads the log: right stations in order, no ghosts. That's a clean run.
The line rewards those who follow it.
The ghosts find those who don't.