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+= 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