Featherweight UI1.1.9 - App Store

The Featherweight Interface app connects any of your Bluetooth-enabled Featherweight Altimeters products to your phone. For the Blue Raven flight computer, use your phone to see live sensor data, set up deployment conditions, download and review recorded flight data, and more! For the Featherweight GPS tracker, your phone points to your rocket and provides all the rocket position, velocity, link quality and tracker health data you would want at your fingertips. Live map feature plots the ground station and tracker locations to plan your recovery.

Version History New Swift firmware
-More reliable LoRa communication
-Improved responses to LoRa comm loss
Phone app improvements:
-Fixed voice telemetry
-Corrected a bug which disabled the tracking pointer after LoRa is lost and the app reset
-Corrected some downloading issues
-Fixed a map view bug
-Fixed issue causing a crash for iPads
-Corrected an issue that could cause the Swift tracker to be set to an undesired channel 1.1.9 4d ago New in this version:
-New Swift firmware
-Improved ground station clock calibration for more reliable LoRa comm
-Identification of corrupted recorded packets
-Improved launch detection avoids false flight recording
-Flight state telemetry provided to phone app
-Added serial telemetry for display of GPS information for scanned trackers (for Launch Sentinel)
-Auto-recovery for LoRa comm loss
-Improved and more reliable data downloading
-Corrected download in the event of a flash data corruption
-Monitor mode for watching another rocket's tracker discovered through the channel list search
-Added flight state display so that you can verify the Swift is in prelaunch mode before launch 1.1.8 Sep 17 New Swift firmware version 8c8fc8f (8/26/2026)
-Increased Bluetooth transmission power for the Swift tracker and ground station
-Improved launch detection
-Improved data recording
-LoRa packets with CRC errors are recorded in GS log with CRC error status marked
-Simulation updates the horizontal position
-Watchdog timer protects against software hangs
UI updates:
-Time since last packet added to tracker screen
-Tracker GPS status is shown over Bluetooth when it is available and a GS LoRa connection is not
Known issues:
-Update the firmware one unit at a time to avoid needing to power cycle
-Excel formatted version of tracker recorded flight requires Excel repairs when opened 1.1.7 Sep 2 -A low-power sleep mode for the Swift tracker that you can control from the phone, which cuts the power consumption by about a factor of 4. Good for making a small battery last longer between flights.
-Lost rocket mode for the Swift tracker. If the Swift lands and doesn't hear from the ground station or the phone for 5 minutes, it starts a sleep/wake cycle that includes a transmission on the original paired tracker channel and the lost & found channel so that other Featherweight trackers can pass along its location. A Swift tracker in lost rocket mode can last longer than 25 hours when using a 400 mAhr battery.
-Improved over-the-air firmware updates
Bug fixes:
-Detect the end of a channel scan
-Preserve the Swift channel number when changing channel plans
-More reliable voice telemetry
-Original tracker channel scan now covers all channels in the original channel plan 1.1.6 Jul 28 New features:
-Flight data (10 Hz+) recorded on-board the Swift tracker, with downloading via Bluetooth
-Simulated flights for the Swift tracker
-The Swift tracker now forwards data from lost original trackers
-Updated UI for lost rocket data 1.1.5 Jul 8 -Fixes a bug that prevented the phone from displaying data from an original tracker if the original tracker's name is less than 11 characters.
-Improves the download interface with a new widget that shows download progress in all screens

No changes to the latest firmware versions

Known issues:
-The ground station log stops recording data prematurely 1.1.4 Jun 12 New features:
Full inter-operability between original ground stations and trackers and Swift ground stations and trackers when using the original channels
Fast scanning of all 3 channel plans when using Swift GS
Swift tracker scans for an open channel before transmitting

Bugs fixed:
Swift LoRa comm is more reliable now with improved time synchronization
Voice telemetry on original trackers and GS is available again
Downloading recorded data is more reliable 1.1.3 May 28 Corrected a previous issue where the LoRa status was showing disconnected when it was actually connected.
Fixes a bug that can cause a device to erroneously show up as a Blue Raven with serial number 0 when it is re-connected to the phone.

Known issues:
1. Voice telemetry is absent
2. In rare cases, if the Swift ground station is Bluetooth-disconnected from the phone and re-connected, it could receive an updated clock time from the phone that is inaccurate enough to cause it to lose sync with the tracker and become LoRa-disconnected. This vulnerability was also present in previous versions. Workaround: Keep the ground station within reach of the phone, especially after the Tracker gets a GPS lock. 1.1.2 May 6 New features:
-Fixed bugs which could cause loss of synchronization and LoRa communication
-Fixed issue with command authorization during connection
-New replay feature shows the rocket tilt during the flight for Blue Raven and Blue Jay flight recordings
-Fixed tracker page display of LoRa connection status

Known issues:
-When changing the LoRa channel of an original tracker, the resulting channel does not match the selected channel
-Channel scanning in the Channel list is not working for Swift, and stops prematurely when using the original Tracker.
-Over-the-horizon relay is not yet supported for the Swift
-Simulated flights are not yet supported for the Swift
-On-board data recording is not yet supported for the Swift. 1.1.1 Apr 29 Build 466 now supports the new Featherweight Swift with basic tracking functionality.
The Swift includes support for the new 240-channel frequency hopping channel plan to reduce LoRa network congestion at large launches
The tracking map view now has live telemetry.
New firmware included for the Blue Jay and Blue Raven, with controlled BLE transmit power to reduce Bluetooth network congestion at large launches 1.1.0 Apr 12 Corrected the text in the dialog box for the over-the-air updates to show correct was/now on build version 1.0.25 Jan 13 -Provided better on-screen instructions in the event that an over-the-air update gets interrupted 1.0.24 Jan 6 - Support for new sensors in Blue Jay 2 and Blue Raven 2
- Blue Jay and Blue Raven: Default apogee settings now include abort for unstable flights if the rocket tilt exceeds 90 degrees within the first 2 seconds after liftoff
- Fixed downloading of tracker and altimeter data from the same flight
- Fixed text to speech feature not working on iOS 26

Known issues: The Blue Jay and Blue Raven require a power cycle once after firmware update is complete. 1.0.23 Jan 2 - Fixed an issue where some of the deployment settings thresholds could be displayed and validated incorrectly. 1.0.22 08/29/2025 -Includes new firmware for the Blue Jay to correct a bug that would erase both sets of recorded flight data in some circumstances
-Improved channel list feature
-Improved sequential downloading when multiple devices have data from the same launch
-Accel calibration now tolerant to temporary disconnections
-My devices list now shows current name and serial number rather than previous version 1.021 08/25/2025 What's new:
-Support for new Blue Jay2 hardware
-Axial & lateral acceleration data now included in Blue Jay flight logs
-Enhanced GPS tracker channel scanning
Bug fixes:
-Fixed LoRa packet success rate display
-Resolved tracker & ground station pairing issues
-Fixed intermittent arming/command issues on Blue Raven & Blue Jay
Known issues:
- If Blue Jay over-the-air update fails, restart the app and ensure it's the only device powered on. Devices may appear off if the update is interrupted.
-Monitoring another user's flights via the channel list can temporarily cause problems re-connecting your ground station to your own tracker. 1.0.20 08/13/2025 Click the middle of the screen to get a voice summary of go for launch
Deployment settings used in a flight are now automatically included with the flight export

Bug fixes:
Channel scan now scans all channels
Improved Bluetooth connection reliability for trackers and ground stations
Improved Bluetooth connection status indications for all devices
Fixed an issue preventing OTA updates for the Blue Raven or Blue Jay while connected to a tracker 1.0.18 03/26/2025 Reliability improvements to several features:
-Data downloads
-Command authorization for Blue Raven and Blue Jay
-Bluetooth connections to trackers and ground stations
-Voice telemetry

Known limitations:
-Over-the-air updates to the Blue Jay or Blue Raven should be performed with all other Featherweight devices turned off. 1.0.17 01/27/2025 Fixed Blue Jay bug that had been corrupting downloaded data in the case where the Blue Jay records until the flash gets full. Includes new Blue Jay firmware.
Fixed bug that sometimes prevented command authorization from completing at power-up. 1.0.16 01/15/2025 Over-the-Air (OTA) updates which could get stuck in certain situations in the last build are now recoverable with this build. 1.0.15 11/27/2024 Improved response to an interrupted Over-the-Air firmware update.
Blue Jay avoids attempting to download non-existent high-rate recorded data.
New Blue Jay firmware has correct behavior in simulations 1.0.14 11/25/2024 Now supports the Featherweight Blue Jay and Blue Jay+
Voice telemetry is more reliable, even with multiple trackers and ground stations

New Blue Raven firmware:
More robust under-voltage protection to reduce chance of power-up glitches
Improved feedback to the phone in the event of unauthorized commands
New Blue Jay firmware
Improved feedback to the phone in the event of unauthorized commands 1.0.13 11/09/2024 Improved interface for Blue Raven Over-the-Air updates.
New Blue Raven firmware that prevents commanding by unauthorized phones. The first phone to connect after power-up is automatically authorized.
Improved status display for LoRa and Bluetooth connections in the Devices page.

Known issues:
When using 2 ground stations and 2 trackers simultaneously, the voice telemetry can have a mixture of data from both trackers 1.0.12 07/29/2024 Now fully supports multiple simultaneous pairs of ground stations and trackers.
Improved calculation of tracker pad altitude offsets
Exported data file names now uses launch time rather than download time
Corrected label for down received packet counters vs up received packet counters
Graphing selections are remembered between sessions

Known issues:
When flying 2 Blue Ravens together, data from one may need to be re-downloaded separately 1.10 05/23/2024 Multiple simultaneous ground stations now supported.
Exporting GPS data recorded on the tracker now includes a .kml file for display in Google Earth.
Improvements to Channel List feature
Voice telemetry improved with lag removed
More reliable data downloading 1.09 04/24/2024