KONZ Grosse Ile Muni

PROBABLE 68%

Runway 22 — wind slightly favors it, low confidence

Based mostly on wind; no traffic or ATIS to confirm. 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.

certainty: 68% evidence: NONE no tower now

Wind 190° true at 4 kt · VFR · 30 min old · from KDTW (10.9 nm away)

▶ Listen live — ATIS/CTAF on LiveATC opens LiveATC’s own player · verify the broadcast yourself

22 69% 4846 ft · 4 kt head, 1 kt x-left

4 31% 4846 ft · 4 kt TAIL, 1 kt x-right · right traffic

17 CLOSED 4424 ft · 4 kt head, 2 kt x-right

35 CLOSED 4424 ft · 4 kt TAIL, 2 kt x-left · right traffic

Active NOTAMs affecting runways

RWY CLOSED RWY 17/35 until 01-02 23:59Z

RWY 17/35 CLSD

Why — evidence behind this answer

Runway 22

WIND 4 kt headwind, 1 kt left crosswind 30 min ago +0.18

Runway 4

WIND 4 kt TAILWIND, 1 kt right crosswind 30 min ago -0.61

Runway 17

NOTAM 17 not considered — closed by NOTAM until 2359Z 02 Jan

Runway 35

NOTAM 35 not considered — closed by NOTAM until 2359Z 02 Jan

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	30 min	Nearest station KDTW (10.9 nm away)
ADSB	WARMING_UP	2572 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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KONZ field & runways

Grosse Ile Muni, Detroit/Grosse Ile, Michigan. Field elevation 590 ft. Non-towered (NON-ATCT). Magnetic variation 7.0°W on record, 7.4°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 0.005°/year west — about 1° every 200 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
17	166.8°	174.2°	matches	4,424 ft	CONC	left	CLOSED
22	210.2°	217.7°	matches	4,846 ft	ASPH	left
35	346.8°	354.2°	matches	4,424 ft	CONC	right	CLOSED
4	30.2°	37.7°	matches	4,846 ft	ASPH	right

Generated 10:23:13Z · auto-refreshes · JSON

KONZ ☆ Grosse Ile Muni