KGTG Grantsburg Muni

PROBABLE 67%

Runway 23 — 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. No ADS-B traffic data available.

certainty: 67% evidence: WEAK no tower now

Wind 200° true at 7 kt · VFR · 20 min old · from KUBE (33.7 nm away)

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23 66% 3280 ft · 6 kt head, 4 kt x-left

12 24% 2999 ft · 1 kt head, 7 kt x-right

30 11% 2999 ft · 1 kt TAIL, 7 kt x-left

5 <1% 3280 ft · 6 kt TAIL, 4 kt x-right

Why — evidence behind this answer

Runway 23

WIND 6 kt headwind, 4 kt left crosswind 20 min ago +1.09

Runway 12

WIND 1 kt headwind, 7 kt right crosswind 20 min ago +0.06

Runway 30

WIND 1 kt TAILWIND, 7 kt left crosswind 20 min ago -0.72

Runway 5

WIND 6 kt TAILWIND, 4 kt right crosswind 20 min ago -5.50

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	20 min	Nearest station KUBE (33.7 nm away)
ADSB	UNAVAILABLE		No ADS-B track history here yet
NOTAM	OK
CIFP	NOT_CONFIGURED		Instrument procedures: phase 4

Recent operations

No operations observed in the last hour. (No ADS-B track history here yet)

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KGTG field & runways

Grantsburg Muni, Grantsburg, Wisconsin. Field elevation 927 ft. Non-towered (NON-ATCT). Magnetic variation 0.0°W on record, 0.7°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 0.034°/year west — about 1° every 29 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
12	120.8°	121.5°	matches	2,999 ft	ASPH	left
23	235.6°	236.3°	runway 24 by the rule today · 6.3° past	3,280 ft	TURF
30	300.8°	301.5°	matches	2,999 ft	ASPH	left
5	55.6°	56.3°	runway 6 by the rule today · 6.3° past	3,280 ft	TURF

Generated 11:15:21Z · auto-refreshes · JSON

KGTG ☆ Grantsburg Muni