Threshold
Features
All the data.
Nothing you have to fight.
Threshold is a data tool. It is not trying to be a certified EFB — it is trying to make the twenty minutes before a flight fast and honest.
The map
Five bases. One aeronautical layer.
Charts
FAA VFR sectional, IFR low and high enroute, a plain aeronautical base and satellite imagery. Tiles cache to your device, and regions can be downloaded for offline use.
Airspace
Class B, C and D plus MOAs, restricted, prohibited, warning and alert areas — drawn the way a sectional draws them, with floor and ceiling labels and a soft band inside the boundary.
Airports
All 13,053 US fields with FAA symbology: tower, fuel, lighting, and a category-coloured centre. Private fields can be hidden when the chart gets busy.
Navaids & waypoints
VOR, VORTAC, VOR/DME, TACAN, DME and NDB in correct chart symbology, with a separate layer for 66,000 RNAV waypoints, reporting points and VFR waypoints.
Radar
An animated NEXRAD loop covering the last fifty minutes, with an intensity legend that says what each band means rather than just showing colours.
Winds aloft
Standard station-model barbs at any of the nine forecast levels from 3,000 ft to FL390, with temperature below each station — tinted blue at or below freezing.
Airspace lives on your device. Every Class B, C, D and special-use boundary in the United States, Alaska, Hawaii and the Caribbean ships with the app — 2,988 polygons. Panning and zooming never wait on a network request, the layer works with no signal at all, and it refreshes itself when the FAA's 28-day cycle rolls over.
Weather & NOTAMs
Read it raw, or read it decoded.
METAR and TAF
Full raw text plus a decoded parameter table. Fields with no observation of their own fall back to the nearest reporting station, clearly labelled as someone else's weather rather than silently substituted.
NOTAMs
Grouped by what actually stops a flight — aerodrome and runway first, then procedures, airspace, navaids and obstructions. Military and overseas NOTAMs render in full.
AIRMET, SIGMET and TFRs
Hazard areas drawn on the map with the same boundary treatment as airspace, tappable for the full text.
PIREPs
Pilot reports from the last three hours, positioned on the map so turbulence and icing reports sit where they were actually filed.
Planning
Routes, plates and the numbers that matter.
Route planning
Type a route the way you'd file it. Legs resolve against airports and navaids, with true and magnetic course, wind-corrected heading, ground speed, leg time and fuel burn.
Aircraft profiles
Cruise speed in KIAS, KGS or MPH, fuel burn in gallons or pounds per hour, and fuel grade from 100LL to Jet A. Saved with each route, so the 172 and the Bonanza stay separate.
Approach plates
FAA terminal procedures by airport, downloadable for offline use. Expired plates are kept and labelled loudly rather than deleted — an old chart you know about beats a missing one.