Reference only — not for real-world navigation.
29C
Grindstone Air Harbor Airport · Port Austin
Key Facts
Essential technical summary for MSFS 2020/2024 and X-Plane.
ILS Approach StatusILS DATA NOT IN DATABASE
Field Elevation
640 ft / 195 m
Transition Altitude
18,000 ft
Primary Channel
—
Live Conversion
inHg
hPa
Runway Summary (Quick-Links)
18/36 · 1,800 ft · TURF-FUNLITFlight Planning
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Welcome to the technical flight briefing for Grindstone Air Harbor Airport (29C), located in Port Austin, United States. As a vital hub for Microsoft Flight Simulator 2024, MSFS 2020, and X-Plane pilots, this facility features 1 active runway with a maximum elevation of 640 ft. Please note that this field primarily supports VFR and visual approach procedures.Reference the data below for primary communication channels and detailed runway characteristics. Pilots should observe a Transition Altitude of 18,000 ft verified for this field for altimeter reset procedures.
Full Name
Grindstone Air Harbor Airport
ICAO / IATA
29C / —
Municipality
Port Austin
Country
Region
US-MI — Michigan
GPS Coordinates
Transition Altitude
18,000 ft
Elevation
640 ft
Pilot Toolbox
External charts, live tracking and weather reports.
Runway 18 / 36
UNLIT
Runway Length: 1,800 ft / 549 m
Runway Width: 85 ft / 26 m
Surface Type: TURF-F
Heading: —° / —°
Runway Width: 85 ft / 26 m
Surface Type: TURF-F
Heading: —° / —°
RWY 18
No ILS / Visual Only
RWY 36
No ILS / Visual Only
No frequency data available.
Base Airport Data: OurAirports (Public Domain)
Instrument Approach Data: AIP 2026 Researched · Cycle: Jan 2026