KHYI San Marcos Rgnl

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. No ADS-B traffic data available. Wind calm — no directional preference.

certainty: — evidence: NONE Class D

Wind calm · VFR · 32 min old · from KAUS (19.8 nm away)

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26 17% 6330 ft

8 17% 6330 ft

13 16% 5601 ft

17 16% 5214 ft

31 16% 5601 ft

35 16% 5214 ft

Active NOTAMs affecting runways

APCH OTS RWY 13 until 10-09 15:28Z

IAP SAN MARCOS RGNL, AUSTIN, TX.
ILS OR LOC RWY 13, AMDT 6D...
NOTE: WHEN LOCAL ALTIMETER SETTING NOT RECEIVED, USE NEW BRAUNFELS ALTIMETER SETTING: INCREASE S-ILS 13 DA TO 835 FEET; INCREASE ALL MDA 60 FEET AND VISIBLITY
CIRCLING CAT C 1/8 SM AND D 1/4 SM. NOTE: FOR INOPERATIVE ALS WHEN USING NEW BRAUNFELS ALTIMETER SETTING, INCREASE S-LOC 13 CAT E VISIBILITY TO 2 SM. HYI AWOS OTS.
2609300400-2610091528EST

Why — evidence behind this answer

Runway 26

PRIOR runway length 6330 ft +0.02

Runway 8

PRIOR runway length 6330 ft +0.02

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	32 min	Nearest station KAUS (19.8 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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KHYI field & runways

San Marcos Rgnl, Austin, Texas. Field elevation 595 ft. Class D airspace. Towered. Magnetic variation 7.0°E on record, 3.1°E 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 0.079°/year west — about 1° every 13 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
13	133.0°	129.9°	matches	5,601 ft	ASPH	left	ILS
17	177.9°	174.7°	matches rule gives runway 18 in ~3 yr	5,214 ft	ASPH	left
26	267.8°	264.7°	matches rule gives runway 27 in ~4 yr	6,330 ft	ASPH	left
31	313.0°	309.9°	matches	5,601 ft	ASPH	left
35	357.9°	354.7°	matches rule gives runway 36 in ~3 yr	5,214 ft	ASPH	left
8	87.8°	84.7°	matches rule gives runway 9 in ~4 yr	6,330 ft	ASPH	left

Generated 10:24:45Z · auto-refreshes · JSON

KHYI ☆ San Marcos Rgnl