No instructions. No given thresholds. No pre-built course. Just students, tape, and everything they've learned. Students design a multi-segment tape course from scratch, calibrate their own thresholds, complete a segment planning table, use a code checklist, then write and test a full navigation program. Teacher notes include physical setup guidance, three no-build alternatives, calibration tips, differentiation strategies, debrief questions, and a 75-point grading rubric with 10-point bonus. Wh