Talk:GPWS

Development and editorial material moved from the article — 27 October 2026

The following original passages were moved or rewritten to keep GPWS focused on operating in Vieneo. They are preserved here as development history, editorial context or source material, not as current operating instructions. Player-facing limits and controls are retained in the article where applicable.

Source: GPWS, revision 5027. The excerpts below preserve the original wikitext, including any obsolete statements and links.

'''GPWS''' (Ground Proximity Warning System, pronounced ''jip-wiz'') warns the crew about unsafe descent, terrain closure, clearance and approach conditions. Rise also provides predictive terrain and obstacle awareness using the terrain and city/colony geometry received by the client.

! Control !! Default binding !! Current Rise behavior

Rise tests both the fine inner terrain mesh and the coarse distant mesh, plus solid components of received cities and colonies. It uses ground-relative movement, vertical speed and observed turns. Buildings are classified as obstacles; ground-level paving and non-solid crops are excluded. A structure in the path can therefore produce '''CAUTION OBSTACLE''' over otherwise low, green terrain.

GPWS uses the latest available sensor and terrain information. Low or uneven frame rates can increase response latency; missing or stale data must not be treated as complete sensor coverage.

<div style="background:#f4ecf8;color:#38263f;border-left:6px solid #753a91;padding:10px;">'''Display patterns:''' sparse/dense patterns use 25%/50% coverage. The Peaks green range is divided into thirds, and known Vieneo water is identified from world data rather than assuming Earth sea level.</div>

[[File:GPWS-mode1-envelope.png|thumb|center|1000px|Mode 1 default Rise envelope. Purple marks the numerical Rise approximation; this plot excludes steep-approach and above-glideslope capture biases.]]

[[File:GPWS-mode2-envelope.png|thumb|center|1000px|Mode 2A/2B reactive closure envelopes. Purple: current Rise curves. Blue dashed line: the cap with terrain awareness available. The fully configured Mode 2B case suppresses Pull Up.]]

'''Modes 4A, 4B and 4C are implemented.'''

Implemented descending radio-height callouts are '''1,000, 500, 200, 100, 50, 40, 30, 20 and 10 feet'''. Installation settings can disable individual heights. The 500-foot call can be unconditional, smart, above-field, or externally controlled/disabled. “Minimums, minimums” uses the configured radio decision height (default 200 ft) and requires gear down.

[[File:GPWS-bank-profiles.png|thumb|center|1100px|Blue/teal: the manual and Autoflyte bank profiles. Purple: Rise's additional spaceflight policy. The graph's height axis is logarithmic; the thresholds increase linearly with height within each ramp.]]

| style="background:#f4ecf8;color:#66317e;" | '''Rise spaceflight/hypersonic exclusion, above 762 m AGL''' || style="background:#f4ecf8;color:#66317e;" | '''Inhibited''' || style="background:#f4ecf8;color:#66317e;" | '''Inhibited'''

==== Rise spaceflight and re-entry rules ====

* With the client's 7.5 km density scale height, the density crossings are approximately '''34.54 km MSL''' and '''29.34 km MSL'''. These are MSL equivalents, not AGL thresholds. The model is exp(−|MSL|/7.5 km), sampled at the current position.

'''Terrain Clearance Floor / Runway Field Clearance Floor:''' separate “Too low terrain” protection compares radio clearance and geometric height above received runway elevation with distance-dependent floors. It remains independent of landing configuration and the predictive runway allowance. Position-integrity settings affect the inner bias. Only received runway data is available; the client does not synthesize a worldwide airport database.

Wind change is measured over a rolling '''one-second interval using sensor timestamps''', independently of rendering frame rate and the map wind readout. Turning in steady wind does not create artificial shear. Unchanged samples retain their result; input older than two seconds is discarded. Reset or recovered input starts a fresh history: horizontal change needs one second, while vertical-wind protection is immediate.

'''Operating band: 10–1,500 ft AGL''', powered and airborne, with valid inputs and hazard inhibit off. Rise protects APN and ACL flight, including level flight and VTOL/hover. Low IAS does not disable it, and it never divides by airspeed. With no ground track, it uses the aircraft's horizontal nose direction; if that also cannot be defined, vertical-wind protection remains available. Ground, vehicle/simulator transitions, invalid inputs and leaving the band clear the history. Re-entry into the band re-arms it. The separate bank-advisory spaceflight exclusion does not suppress fast near-ground windshear protection.

The automatic [[E-10 Saint#Overspeed warning|overspeed clacker]] is a separate continuous warning. It requires avionics power and a valid positive Vne. It stops on the next audio update when indicated airspeed no longer exceeds that limit, either speed input is invalid, or cockpit power reaches the VMU power-off cutoff (including shutdown). Invalid power data also stops it. After power returns, only a currently valid overspeed condition can re-arm it; audio reloads cannot revive it while unpowered. The E-10 has no configured Vne; an unset limit must not trigger clacking at low speed.

'''Finish the active phrase.''' Normal changes in hazard priority discard stale queued speech but let the current recording finish. Power/vehicle/simulator transitions clear invalid state rather than replaying stale warnings. Missing voice assets can leave a visual caution without its expected spoken phrase; a displayed caution is not evidence that its recording is installed.

The combined test control runs '''Level 1''' while powered, on the ground and not inhibited. It exercises indications, complete Glideslope / Pull Up / Terrain Terrain phrases and a terrain test pattern, then ends. Takeoff, power loss, vehicle change or hazard inhibit cancels the test. Diagnostic bus commands also provide levels 2–6 for current faults, installation/data information, session fault history, session warning history and changing discretes. These histories are session-only; spoken maintenance descriptions and nonvolatile maintenance logs are not implemented.

[[Category:Avionics]]