VFR-descent planner

Advisory route planning

Suggest a route that keeps a VFR-reporting airport within range at every point — ETOPS planning with a live-weather suitability predicate.

This tool suggests a route and shows margins. It never asserts that the weather will hold or that the route is authoritative. Stale or missing weather makes an airport unusable (fail-safe). Advisory / planning use only — not for navigation.

Plan a VFR-descent route

Range defaults to a 40 nm distance disk. Time-at-speed (range_min + speed_kt) and glide (glide_ratio + altitude_ft) modes are available as query parameters — see /v1/plan. Plans are capped at 600 nm great-circle — farther than that, use the trip planner.

Local equirectangular projection, north up. Green fills are range rings (radius R) around suitable, VFR-reporting airports — their union is the covered region. 28 suitable airports in the region. Coverage is tested by sampling the great circle every sampleSpacingNm; a covered verdict is exact only to ±sampleSpacingNm/2. An uncovered sliver narrower than the spacing can be missed. Advisory, not a defended claim.

Route · 6 legs · 230.9 nm

#	From	To	Via	Dist (nm)	Coverage
1	S95	MAHXO	join	37.6 nm	covered
2	MAHXO	KOTAA	corridor	23.5 nm	covered
3	KOTAA	VECCU	corridor	44.8 nm	covered
4	VECCU	JJACE	corridor	58.8 nm	covered
5	JJACE	ENDNG	corridor	29.7 nm	covered
6	ENDNG	KCVO	join	36.6 nm	covered

Great-circle A→B is 225.9 nm; the planned route is 230.9 nm.

Diversion table (ETOPS-style)

Leg	Nearest suitable	Bearing (°)	Dist (nm)	Best cover	Margin (nm)
S95→MAHXO	KHRI	249°	0.1 nm	KPDT	12.4 nm
MAHXO→KOTAA	KHRI	074°	0.1 nm	KHRI	16.4 nm
KOTAA→VECCU	KDLS	262°	13.2 nm	KDLS	▼ -17.7 nm
VECCU→JJACE	KDLS	046°	3.5 nm	KDLS	▼ -6.2 nm
JJACE→ENDNG	KUAO	307°	22.1 nm	KUAO	9.2 nm
ENDNG→KCVO	KCVO	232°	0.0 nm	KCVO	3.4 nm

Per leg: the nearest suitable airport (bearing from the leg midpoint) and the single airport that best blankets the leg, with margin = R − its worst-point distance. A negative margin (▼) means no single airport covers the whole leg — the union still may; this is a per-airport lower bound, not an over-claim.

Snapshot & configuration

Nav cycle: 2607
Artifact: 66355e9d67a7
METAR reports used: 35 of 383
Oldest observation: 2026-07-16T07:56:00.000Z
Range R: 40 nm → 40.0 nm
Weather minimum: VFR only · 75 min max age
Routing: mixed · corridor 30 nm
Constraint: hard
Min runway: 3000 ft
Coverage test: ±0.75 nm

This plan is reproducible from the values above: the same nav cycle, artifact, METAR observation times, and config yield the same route. Coverage is tested by sampling; a “covered” verdict is exact only to the tolerance shown. Weather is an ephemeral overlay — never merged into the navigation data.

Advisory / planning only · AIRAC cycle 2607 · not a certified navigation source.