KMRT Union County

UNKNOWN

Unknown — not enough evidence to call a runway

We don't know, and saying so beats guessing. No D-ATIS feed here — a voice ATIS/AWOS may exist; check the frequency. ADS-B tracking just started here — traffic history is still building. Wind calm — no directional preference.

certainty: — evidence: NONE no tower now

Wind calm · VFR · 33 min old · from KCMH (25.9 nm away)

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9 37% 4218 ft · calm-wind rwy

27 22% 4218 ft

26 20% 2522 ft

8 20% 2522 ft

Why — evidence behind this answer

Runway 9

PRIOR 9 is the designated calm-wind runway +0.50
PRIOR runway length 4218 ft +0.05

Runway 27

PRIOR runway length 4218 ft +0.05

Runway 26

PRIOR runway length 2522 ft -0.05

Runway 8

PRIOR runway length 2522 ft -0.05

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	33 min	Nearest station KCMH (25.9 nm away)
ADSB	WARMING_UP	1080 min	Only 0 min of track history so far
NOTAM	OK
CIFP	NOT_CONFIGURED		Instrument procedures: phase 4

Recent operations

No operations observed in the last hour. (Only 0 min of track history so far)

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KMRT field & runways

Union County, Marysville, Ohio. Field elevation 1021 ft. Non-towered (NON-ATCT). Magnetic variation 5.0°W on record, 7.0°W today.

The FAA's variation of record is the number this field was surveyed against; the second is where north points now, from WMM2025. It is moving 0.018°/year west — about 1° every 56 years — which is why runway numbers eventually stop matching their pavement.

Runway data from the FAA NASR 01 Oct 2026 cycle. Where NASR locates both thresholds, the true heading is the bearing between them rather than NASR's whole-degree alignment. Magnetic is that heading against *today's* declination from WMM2025, not the field's variation of record — so it can differ from the chart by the gap between the two shown above. The number painted on the runway is the one ATC uses.
Runway	True	Magnetic	Number	Length	Surface	Pattern	Notes
26	263.0°	270.0°	runway 27 by the rule today · 10.0° past	2,522 ft	TURF
27	263.0°	270.0°	matches	4,218 ft	ASPH	left
8	83.0°	90.0°	runway 9 by the rule today · 10.0° past	2,522 ft	TURF
9	83.0°	90.0°	matches	4,218 ft	ASPH	left	calm-wind CALM WIND RWY.

Generated 10:23:41Z · auto-refreshes · JSON

KMRT ☆ Union County