== 北极界上 85°，继续向北（应钉在 85） ==
  1: north=1895880 → 0.0000,85.0000
  2: north=1895880 → 0.0000,85.0000
  3: north=1895880 → 0.0000,85.0000
  4: north=1895880 → 0.0000,85.0000
  5: north=1895880 → 0.0000,85.0000
  6: north=1895880 → 0.0000,85.0000
== 赤道附近向北（应正常推进） ==
  1: north=1895880 → 0.0000,27.1511
  2: north=1895880 → 0.0000,44.3022
  3: north=1895880 → 0.0000,61.4532
  4: north=1895880 → 0.0000,78.6043
  5: north=1895880 → 0.0000,85.0000
  6: north=1895880 → 0.0000,85.0000
== 南极界上 -85°，继续向南（应钉在 -85） ==
  1: north=-1895880 → 0.0000,-85.0000
  2: north=-1895880 → 0.0000,-85.0000
  3: north=-1895880 → 0.0000,-85.0000
  4: north=-1895880 → 0.0000,-85.0000
  5: north=-1895880 → 0.0000,-85.0000
  6: north=-1895880 → 0.0000,-85.0000
== 界内侧 82°，向北（应停在 85） ==
  1: north=1895880 → -170.0000,85.0000
  2: north=1895880 → -170.0000,85.0000
  3: north=1895880 → -170.0000,85.0000
  4: north=1895880 → -170.0000,85.0000
  5: north=1895880 → -170.0000,85.0000
  6: north=1895880 → -170.0000,85.0000
== 界上东西向（应绕极轴有界移动，纬度不变） ==
  1: east=-6319600 → -113.5393,85.0000
  2: east=-6319600 → 132.9213,85.0000
  3: east=-6319600 → 19.3820,85.0000
  4: east=-6319600 → -94.1574,85.0000