--- /dev/null
+= Release Notes for Version 1.2.1
+:toc!:
+:doctype: article
+
+ Version 1.2.1 is a minor release. It adds support for TeleBT and
+ the AltosDroid application, provides several new features in
+ AltosUI and fixes some bugs in the AltOS firmware.
+
+ == AltOS
+
+ AltOS new features:
+
+ * Add support for TeleBT
+
+ AltOS fixes:
+
+ * In TeleMini recovery mode (when booted with the
+ outer two debug pins connected together), the radio
+ parameters are also set back to defaults
+ (434.550MHz, N0CALL, factory radio cal).
+
+ * Correct Kalman filter model error covariance
+ matrix. The values used previously assumed
+ continuous measurements instead of discrete
+ measurements.
+
+ * Fix some bugs in the USB driver for TeleMetrum and
+ TeleDongle that affected Windows users.
+
+ * Adjusted the automatic gain control parameters that
+ affect receive performance for TeleDongle. Field
+ tests indicate that this may improve receive
+ performance somewhat.
+
+ == AltosUI Application
+
+ AltosUI application new features:
+
+ * Make the initial position of the AltosUI top level
+ window configurable. Along with this change, the
+ other windows will pop up at 'sensible' places now,
+ instead of on top of one another.
+
+ * Add GPS data and a map to the graph window. This
+ lets you see a complete summary of the flight
+ without needing to 'replay' the whole thing.
+
+ AltosUI application fixes:
+
+ * Handle missing GPS lock in 'Descent'
+ tab. Previously, if the GPS position of the pad was
+ unknown, an exception would be raised, breaking the
+ Descent tab contents.
+
+ * Improve the graph, adding tool-tips to show values
+ near the cursor and making the displayed set of
+ values configurable, adding all of the flight data
+ as options while leaving the default settings alone
+ so that the graph starts by showing height, speed
+ and acceleration.
+
+ * Add callsign to Monitor idle window and connecting
+ dialogs. This makes it clear which callsign is being
+ used so that the operator will be aware that it must
+ match the flight computer value or no communication
+ will work.
+
+ * When downloading flight data, display the block
+ number so that the user has some sense of
+ progress. Unfortunately, we don't know how many
+ blocks will need to be downloaded, but at least it
+ isn't just sitting there doing nothing for a long
+ time.
+
+ == AltosDroid
+
+ * First version of this application