Reference only — not for real-world navigation.
NA90
Circle Z Landing Strip · Underwood
Key Facts
Essential technical summary for MSFS 2020/2024 and X-Plane.
ILS Approach StatusILS DATA NOT IN DATABASE
Field Elevation
2,000 ft / 610 m
Transition Altitude
18,000 ft
Primary Channel
—
Live Conversion
inHg
hPa
Flight Planning
Quick Jump to Next Destination
Tip: Search your next airport to quickly compare ILS data.
Welcome to the technical flight briefing for Circle Z Landing Strip (NA90), located in Underwood, United States. As a vital hub for Microsoft Flight Simulator 2024, MSFS 2020, and X-Plane pilots, this facility features 2 active runways with a maximum elevation of 2,000 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
Circle Z Landing Strip
ICAO / IATA
NA90 / —
Municipality
Underwood
Country
Region
US-ND — North Dakota
GPS Coordinates
Transition Altitude
18,000 ft
Elevation
2,000 ft
Pilot Toolbox
External charts, live tracking and weather reports.
Runway 13 / 31
UNLIT
Runway Length: 1,900 ft / 579 m
Runway Width: 50 ft / 15 m
Surface Type: Turf
Heading: —° / —°
Runway Width: 50 ft / 15 m
Surface Type: Turf
Heading: —° / —°
RWY 13
No ILS / Visual Only
RWY 31
No ILS / Visual Only
Runway 08 / 26
UNLIT
Runway Length: 1,000 ft / 305 m
Runway Width: 50 ft / 15 m
Surface Type: Turf
Heading: —° / —°
Runway Width: 50 ft / 15 m
Surface Type: Turf
Heading: —° / —°
RWY 08
No ILS / Visual Only
RWY 26
No ILS / Visual Only
No frequency data available.
Base Airport Data: OurAirports (Public Domain)
Instrument Approach Data: AIP 2026 Researched · Cycle: Jan 2026