AVECT 1.2.4 updates grade estimation to use the same altitude changes as the fused altitude display. - Continuous altitude changes used by FUSED ALT now also inform grade estimates over traveled distance. - Corrections to the GNSS altitude reference are kept separate from actual climbs and descents when calculating grade. - Grade shows “—” when there is insufficient evidence of altitude change or travel distance. - RELIABILITY is steadier across regular GNSS updates while remaining responsive to important drops in the estimate's reliability.

How fast is your elevator climbing? Watch the altitude and vertical speed change as you travel between floors. Try AVECT as an altimeter and turn an everyday ride into a little experiment. When measurement begins, the altitude reading may take around a minute to settle. The time varies with conditions, so check that the reading has settled before trying it on an elevator ride. AVECT 1.2.3 improves speed display during unreliable reception and the response to pressure-based altitude changes. - GNSS recovery now checks multiple observations and prevents an expired speed estimate from reappearing. - Revised IMU support during reception gaps. Even with a fixed device, support lasts at most 10 seconds from the last speed reference. Device motion or uncertainty can make speed unavailable sooner. - Sustained relative pressure changes can update altitude and vertical speed even without a horizontal speed reading. Revised checks for abrupt pressure changes and pressure disturbances during fast travel. - Improved handling of delayed sensor input and aligned speed warnings in the display and CSV. - Added CSV diagnostics for sensor delays, app state, and speed and altitude estimation. During long reception gaps or insufficient speed evidence, speed shows “—” and distance is not accumulated for that interval.

AVECT 1.2.2 adds official support for iOS 27 and improves display update reliability. - Fixed an issue where speed, altitude, elapsed recording time, and other readings could stop updating while measurement and CSV recording continued. Updated the refresh behavior of both the dashboard and the full-screen speedometer. - Improved on-screen feedback after using SET 0 or starting or stopping a recording, so results and recording status appear promptly. - Improved the resumption of display updates when returning from the background. Measurement and estimation logic and the CSV recording format are unchanged.

AVECT 1.2.1 adds speed and altitude unit preferences and improves interstation distances, altitude status, and grade estimation. - Added SETTINGS with main speed units (km/h, mph, kt) and altitude units (m, ft). The speedometer, scale, speed change rate and vertical speed follow these preferences. GUIDE is now inside SETTINGS. - Added altitude status indicators for GNSS priority, pressure support and HOLD. - Fixed stale station information remaining after a return from the background. The display now waits for a fresh position. - Revised grade estimation to use recent altitude changes and travel distance when the route changes between uphill and downhill sections. - Aligned travel distance with the time of each pressure measurement and adjusted GNSS altitude comparisons to cover the same section. - The GNSS/IMU bar now briefly responds when IMU data contributes to speed updates during departures, acceleration, or deceleration. - Simplified CSV recordings to 67 columns covering observations and recording conditions, removing duplicates and unnecessary internal diagnostics. - Interstation distances now follow the bundled track data. The nearest-station-only display continues to use straight-line distance. - Reorganized GUIDE to begin with practical instructions and clarified speed change rate, lateral G, reliability, and grade readings. - Added feature and station-coverage information to the subscription screen and clarified renewal after the free trial.

AVECT 1.2.0 improves speed estimation during departures, stops, and GNSS recovery, and makes measurement displays easier to read. - Improved acceleration handling for different device orientations and travel-axis learning in AUTO. - Fixed departure and stop detection issues, including a stationary state persisting after GNSS confirmed movement. - Improved handling of stale or unstable GNSS readings and speed estimation when reception returns. Speed shows “—” when there is insufficient measurement evidence. - The dashboard and speedometer now show the two-second average rate of change in FUSED speed. Windows crossing large recovery corrections or SET 0 are excluded; lateral G remains an IMU measurement. - Improved grade estimation at higher speeds and the indication of temporarily held grade values. - Refined text, spacing, and controls on the dashboard and portrait speedometer, including warning messages and SET 0. - Updated GNSS/IMU contribution displays, GUIDE, and CSV diagnostics.

AVECT 1.1.0 completely refreshes the core vehicle-state engine. Speed, position, rail segment, and grade now run consistently through one event-driven chain. - Velocity: trustworthy GNSS remains the absolute speed reference. IMU use is bounded to observable launch detection and short bridging between GNSS updates. Delayed GNSS is reconciled at measurement time, with explicit handling for outliers, outages, stop recovery, and uncertainty. Stale low-quality fixes can no longer establish a cold-start speed by themselves. - Position: accepted velocity is integrated downstream and corrected by GNSS position. Distance and position uncertainty are tracked, with no feedback from position or station context into speed. - Rail segments: when AVECT is opened mid-journey, one clear valid GNSS fix on an unambiguous single-line alignment can show a direction-free “Station A—Station B” segment without prior station history or a confirmed previous station. Direction can be established later from course or additional observations; parallel tracks, junctions, close alignments, and tied candidates remain withheld. - Altitude and vertical speed: GNSS provides a slowly corrected altitude datum while fine pressure-height changes remain responsive. Vertical speed in m/min and ft/min makes indoor and elevator movement observable. When aircraft cabin pressure causes a large disagreement, pressure altitude is rejected and GNSS altitude takes priority. - Grade: changes in barometric altitude are checked against GNSS altitude, then estimated robustly over distance. A grade-only shield excludes cabin-pressure changes correlated with acceleration and braking, and a clear GNSS/barometer trend disagreement withholds the value. Grade never feeds back into speed or position. - Logging and Guide: each recording now saves speed, position, sensor, and estimator-state data in one CSV file. GUIDE now documents segment Quick Look, the estimator chain, communications, and privacy. - Subscription: entitlement is checked before network-backed product metadata at launch, so active subscribers enter the app without passing through the purchase screen. Product-loading retry and safer measurement/CSV finalisation during access transitions are also included.

AVECT 1.0.3 improves speed response, the iPad layout, and the subscription screen. - Fine-tuned acceleration and GNSS speed criteria at departure so the speed display responds sooner. - Refined the iPad layout for more readable width and spacing. - Improved subscription-status checks and added direct links to the Terms of Use and Privacy Policy.

Added a 7-day free trial and monthly subscription.

AVECT 1.0.1 improves source-bar clarity and the in-app Guide. - Fixed the GNSS / IMU bar so its black separator follows the color boundary while the displayed balance moves between 0 and 100%. - Reworked GUIDE around startup conditions, SET 0, reading the display, the algorithm, and station coverage on supported lines in Japan. - After SET 0 when GNSS is unavailable, AVECT can show a short capped provisional IMU speed only after it confirms a stationary baseline and a directionally coherent launch (up to 3 seconds / 1.5 m/s). GNSS speed is then accepted only after two independent fixes and smoothly corrects the provisional value. - Clarified in GUIDE and the App Store images that station-segment and nearest-station displays cover supported lines in Japan.

AVECT has reached version 1.0. This release brings together the features and refinements developed to make observing a train journey more engaging, marking AVECT's official release. - Refined the station-segment view to show the previous and next stations and the distance to each. - Added a line-and-dot progress indicator when the current station segment can be confirmed. - When the segment is ambiguous, or AVECT detects a stop or arrival, it now switches to the nearest-station view. - Added a clearer boundary and outline to the GNSS / IMU bar, making the source visualization easier to read. - Unmeasured values now consistently appear as dashes. - IMU acceleration P95 now follows the same two-second averaged series used by the display. - Lateral acceleration and lateral g, altitude, and vertical rate now follow the same measurement-availability state. - Improved display updates and general stability.

• Added a progress indicator showing your current position between the previous and next stations. • Refined the GNSS/IMU contribution visualization for clearer reading. • Added a sensor fusion overview to About & Guide.

- Added SET 0 km/h to reset the speed estimate while stopped or when GNSS speed is unavailable. - Improved launch detection when the device’s forward axis has not yet been determined, including sideways handheld use. - Improved GNSS and motion-sensor coordination during short reception gaps and after GNSS recovery. - Acceleration and P95 now use a two-second moving average of IMU measurements. - Changed km/h, kt and mph speed readouts to clear integer values. - Added continuous GNSS / IMU contribution and Reliability bars. - Clarified when lateral G is unavailable because the device’s lateral axis has not yet been determined.

•Added a visualization of the GNSS/IMU estimation balance and a five-step output-confidence indicator. •Redesigned the full-screen speedometer with a clear, fixed 320 km/h scale. •Simplified status and warning presentation for easier reading. •Updated the in-app guide with the recommended RESET procedure after launch and explanations of the new indicators. •Corrected the privacy policy link.

Improved speed tracking when GNSS positioning accuracy temporarily deteriorates. Optimized coordination between GNSS and motion sensors during acceleration and braking in fixed use.

Version 0.9.5 (Build 35) — Changes since 0.9.4 GNSS speed can now be viewed immediately after launch. Speed reference controls have been combined into a single RESET button. Improved launch detection and speed estimation during brief GNSS interruptions. Improved recovery of residual speed readings after stopping. Simplified the main screen and added landscape support to the full-screen speedometer. Improved CSV log saving and station data loading. Added an illustrated guide for the standard fixed position and flexible handheld use. Additional display and stability improvements.