Grindstone Air Harbor Airport (Port Austin, MI) 29C لوحات خرائط قواعد الطيران الآلي
| 19 | KBAX | Huron County Meml | Bad Axe, MI |
| 31 | 6D9 | Iosco County | East Tawas, MI |
| 37 | KOSC | Oscoda/Wurtsmith | Oscoda, MI |
| 41 | Y83 | Sandusky City | Sandusky, MI |
| 49 | KCFS | Tuscola Area | Caro, MI |
