O2O 50km cut off route 2.0 ON_FOOT_WALKING UNKNOWN 39658.8472826 1386.5600000 SJ 1210 6896 Checkpoint 1 SJ 1467 6574 Checkpoint 2 SJ 1712 6110 Checkpoint 3 SJ 1984 6267 Checkpoint 5 O2O 50km cut off route