// FLYSIGHT 2 GUIDE · ENGO 3 · ACTIVELOOK HUD
Use an ENGO 3 HUD with FlySight 2
HONEST HARDWARE STATUS · UPDATED 20 AUGUST 2026
The Groundrush firmware sends live FlySight 2 flight data to ENGO 3 glasses through the ActiveLook display system. Groundrush on the phone installs the firmware, binds a specific pair of glasses and provides the HUD controls.
The glasses connect to a real FlySight and stay connected. The phone-side layout editor and individual HUD settings are built, but their final readability and every setting have not yet been proven through the glasses in daylight. The beta labels that distinction instead of hiding it.
What you need
- A FlySight 2.
- ENGO 3 glasses running ActiveLook firmware.
- The custom ENGO HUD firmware for the FlySight 2.
- The Groundrush beta on Android or iOS for binding and configuration.
1. Install the FlySight firmware
On a computer with Chrome or Edge, open the FlySight 2 firmware flasher. It reads the public-key line from flysight.txt, selects the encrypted image for that manufacturing batch and verifies its SHA-256 checksum.
Put the FlySight into its orange-light bootloader, select the FlySight drive and let the flasher place APP.SFB under FW/. Eject the drive before powering the logger back up. The complete manual path is on the flasher page too.
2. Bind the ENGO 3 glasses
- Unplug the FlySight from USB and connect to it from Groundrush's Device tab.
- Open the ENGO 3 controls and scan for the glasses.
- Select the intended pair. Groundrush writes that binding to the FlySight so the logger reconnects to the same glasses.
- Confirm the HUD status shows a live glasses connection before relying on it outside.
3. Choose what the HUD shows
The current beta can arrange altitude, horizontal and vertical speed, glide ratio, satellite status, logger and glasses battery, firmware version and takeoff indication. Each reading can be moved, resized, hidden or given its own units and decimal precision.
This editor is deliberately marked as not yet field-proven. Until a layout has been read through the glasses in the conditions where it will be used, treat it as a test layout rather than operational information.
What has been verified
- The web flasher installs the correct batch-specific image on a real FlySight 2.
- The Android app downloads the right published firmware and updates a FlySight over Bluetooth.
- ENGO 3 glasses connect to the FlySight and remain connected.
- Phone-side HUD settings and the layout editor exist, but final in-glasses field testing is still open.
Recovery and official firmware
A failed application-image copy does not overwrite the FlySight bootloader. Return to the orange-light bootloader and copy a valid image again. To leave the custom firmware, obtain the appropriate release from the official FlySight firmware page and install it through the same bootloader mechanism.
Groundrush is an independent project and is not made by, endorsed by or affiliated with FlySight, ENGO or ActiveLook.