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= Release Notes for Version 1.8.1
:toc!:
:doctype: article
Version 1.8.1 includes an important bug fix for Apogee Lockout
operation in all flight computers. Anyone using this option
must update firmware.
This release also contains a change in how flight computers
with accelerometers deal with speeds around and above Mach
1. In previous versions, the flight computer would completely
disregard the barometric sensor above 330m/s (around Mach
1). Now, the data from the barometric sensor is reduced in
effect without ever going away entirely. This prevents early
drogue deployment for flights which spend considerable time
above Mach 1.
1.8.1 also contains a couple of minor fixes for AltosUI when
analyzing saved data files.
== AltOS
AltOS Bug Fixes
* Handle time value wrapping in Apogee Lockout
correctly. Without this, apogee lockout would sometimes
prevent any drogue charge from firing.
* Change Kalman filter on flight computers with accelerometer
to continue using the barometric sensor even at high speeds
to avoid unintentional drogue deployment during
deceleration.
== AltosUI and TeleGPS Applications
AltosUI New Features
* Add new 'Huge' font size to make text even bigger on high
resolution monitors.
AltosUI Bug Fixes
* Prevent some crashes when reading older saved flight data
for graphing or KML export.
* Load frequency preference at startup. The loading code was
broken, so you'd see only the default frequencies.
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