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+<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Release Notes for Version 1.8.1</title><link rel="stylesheet" type="text/css" href="am.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /></head><body><div xml:lang="en" class="article" lang="en"><div class="titlepage"><div><div><h2 class="title"><a id="idm1"></a>Release Notes for Version 1.8.1</h2></div></div><hr /></div><p>Version 1.8.1 includes an important bug fix for Apogee Lockout
+operation in all flight computers. Anyone using this option
+must update firmware.</p><p>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.</p><p>1.8.1 also contains a couple of minor fixes for AltosUI when
+analyzing saved data files.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_altos"></a>1. AltOS</h2></div></div></div><p>AltOS Bug Fixes</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
+Handle time value wrapping in Apogee Lockout
+correctly. Without this, apogee lockout would sometimes
+prevent any drogue charge from firing.
+</li><li class="listitem">
+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.
+</li></ul></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_altosui_and_telegps_applications"></a>2. AltosUI and TeleGPS Applications</h2></div></div></div><p>AltosUI New Features</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
+Add new <span class="emphasis"><em>Huge</em></span> font size to make text even bigger on high
+resolution monitors.
+</li></ul></div><p>AltosUI Bug Fixes</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
+Prevent some crashes when reading older saved flight data
+for graphing or KML export.
+</li><li class="listitem">
+Load frequency preference at startup. The loading code was
+broken, so you’d see only the default frequencies.
+</li></ul></div></div></div></body></html>
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