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  • best iNav F3 board with M8N GPS / Compass - Quad-X  Sirius™ AIR3 in AU NZ USA EU
  • iNav connection wiring diagram to Sirius™ AIR3 F3 board with M8N GPS / Compass  , AU NZ USA EU
  • best iNav F3 board with M8N GPS / Compass - Quad-X  Sirius™ AIR3 in AU NZ USA EU - Set ports as per ports photo this tab
  • best iNav F3 board with M8N GPS / Compass - Quad-X  Sirius™ AIR3 in AU NZ USA EU - Set ports as per ports photo this tab
  • best iNav F3 board with M8N GPS / Compass - Quad-X  Sirius™ AIR3 in AU NZ USA EU
  • best iNav F3 board with M8N GPS / Compass - Multicopter engine numbers - inav -   Sirius™ AIR3 in AU NZ USA EU
  • optional DIY GPS "Short wires" Hack - for small Quads we removed the long GPS/Compass wires and replaced them with these shorter wires - Twisted
  • iNav magnetic declination chart - for Quads, tricopter or Avatar.  Red numbers are positive.
  • If you want to combine an AIR3 with OSD(excluded) and iNav for a small quad - you must order the SLIM mount separately see http://www.multiwiicopter.com/products/knife-200-240-hero32-plate-fr4
  • AIR3 iNav features 4  x UARTS ; UART1 = USB/OSD ; UART2= Sbus Rx ; UART3=GPS ; UART4 = Soft Serial SS datalinks for Nav
  • iNav AIR3 GPS Spektrum™ DX6 DSMX connection diagram
  • iNav AIR3 GPS Spektrum™ DX8 DSMX Satellite Receiver - connection diagram - Set UART2=Serial Rx; Config Serial Receiver ; SpekSat ; Spektrum 2048
  • battery fitted to lower side for more stable CofG - best iNav F3 board with M8N GPS / Compass - Quad-X  Sirius™ AIR3 in AU NZ USA EU - AIR3 - shown fitted to a 240mm Scarab™ Knife
  • best iNav F3 board with M8N GPS / Compass - Quad-X  Sirius™ AIR3 in AU NZ USA EU - AIR3 - shown fitted to a 240mm Scarab™ Knife
  • best iNav F3 board with M8N GPS / Compass - Quad-X  Sirius™ AIR3 in AU NZ USA EU - AIR3 - shown fitted to a 240mm Scarab™ Knife
  • best iNav F3 board with M8N GPS / Compass - Quad-X  Sirius™ AIR3 in AU NZ USA EU - AIR3 - shown fitted to a 240mm Scarab™ Knife
  • best iNav F3 board with M8N GPS / Compass - Quad-X  Sirius™ AIR3 in AU NZ USA EU - AIR3 - shown fitted to a 240mm Scarab™ Knife

iNav Sirius™ AIR3 F3 with M8N GPS / Compass - Quad-X FPV with full GPS Lock & RTLand

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Product Description

in stock iNav Sirius™ AIR3  F3 SPI - Quad (or Tricopter/Avatar) FPV Mission version, includes optimised M8N GPS / Compass - iNav 1.8 is the newest 2017 codebase to cater for incredible GPS lock accuracy, altitude Hold, stabilised flight, navigation, return to land with better than dji accuracy and uses a Google Chrome Extension UI, making it easy to connect, adjust and customise settings from your Mac or PC  laptop using USB or via Apps to BLE on soft Serial Port UART4.  Importantly for FPV pilots Sirius™ AIR3 iNAV features OSD Tx/Rx pins externally to provide data to a MWOSD Minum such as Andromeda.  The M8N GPS firmware has been specifically coded by us for iNav to seamlessly suit both southern hemisphere and northern users alike. 


 Sirius™ Air3 + GPS Hardware Features

  • AIR3 features a full inertial damping polycarbonate/CNC Aluminium base case, three internal LED's including GPS locked LED pulsing RED = home point recorded -  Riding on the GEL base are full suite of Sensors SPI MPU6500 Gyro/SPI Bosch 280 Acc/SPI Bosch BMP280 Baro/ M8N GPS optimised for iNAV / i2c 5883 Compass Mag (mag not used for fixed wing as heading is derived from the GPS) ; 19g including metal/Polycarbonate case @47x32x18mm
  • Full M8N GPs / Compass plug play - Optimised firmware for iNAV AU, NZ, USA, EU - This GPS in this form is unbelievably accurate - 25cm RTL results ; superfast start - typically finds 16-19 Sats in AU skies ; 15g @ 45mm Ø
  • For Quad-X or Tricopter/Avatar with GPS and OSD data Output
  • 3 uARTs for GPS/Sbus or PPM/OSD and USB + 4th Soft Serial UART4 for datalink/BLE

iNav 1.8 Software

  1. comes pre-coded with iNav 1.8 for Quad-X. Our flight tested PIDs are already installed ;
  2. download iNav from the Google Chrome store HERE

Features we like about iNav >1.7.2 software

  1. Inertial based system - incredibly accurate --  with stable BARO calculations gives sub-metre accuracy - the included GPS typically finds 16-19 Sats even in Australia and is very fast to acquire, around 35 secs cold, instant acquire after battery exchange.  AIR3 will flash the red in 3/sec once the home point is recorded/locked.
  2. Amazing Fast GPS start- 30secs from cold and 20cm Return to Land ability - rock solid GPS Loiter -> After power up wait for AIR3 RED LED to pulse then ARM ; once beyond 20m switch to Failsafe RTL
  3. A new "curve" based TPA which reduces gyro sensitivity at high throttle settings  
  4. Return to loiter or land as per your settings for failsafe - We recommend to program your FrSky Rx to FAILSAFE mode preset (press X4R or X8R button with this mode action) as opposed to RTH - see here for details  and also HERE
  5. Highly capable iNav Dev Team led by DigitalEntity DE here ; with monthly development cycles planned - We are a full sponsor of iNav - true believers in it's future - you can help HERE


  • Includes firmware optimised M8N GPS  + Compass module - plug-n-play ready ; 300mm lead wire
  • CASE - AIR3 Supplied inside the Poly-Aluminium case  as per photo this page - if you need the 20.5mm slim mount (excluded)  it is HERE ; Gel tape is HERE
  • Includes Sirius™ AIR3 pre-coded Quad-X Sbus with iNAV 1.8 - tested by us - plug-n-play ready
  • Includes Sbus wire for 16 Channels (we recommend a Max of 95% for Sbus Channels - this means don't set channels to 110 or 120% - only 95% or less)
  • Includes i2c MAG used in current 1.8 (BlueGreen connectors to M5/M6 see photo)  

Excludes /Recommended

  • requires a uBEC with 5.0v HERE ( or used 4.9v outlet of Andromeda)
  • Excludes OSD overlay board - Andromeda is recommended -  Here
  • for micro builds the 20.5mm slim mount (excluded)  it is HERE ; Gel tape is HERE
  • excludes older style, Rx multi wire connector - this restricts the inputs to THRO, AILER, ELEV, RUDD , Aux 1 and Aux2 - useful if you have older Rx without Sbus or PPM


Training on iNav setup



AIR3 iNav QuadX connections and port diagram



iNAV USB Port connection - load the SILABS drivers first - be sure the port selected is the USB port  PC=Comm or ; Mac OSX = /dev/cuSLAB_USB - set speed to 115200 baud 

iNAV Accelerometer Calibration (SETUP TAB)  Calibrate button must be clicked 6 times for INERTIAL - so each time the AIR3 must be be in the 6 sequence different of assigned positions - hold until it shows completed in the log (as supplied USB arrow = front - if you wipe/replace the firmware the front will be the rear pins until you enter yaw 180)  1. top of case up towards sky ; 2. flip upside down ; 3. on right side ; 4. with nose-up ; 5. on left side ; 6. with nose-down


iNAV Compass Calibration (only used for multicopters Quads,Avatar or Tricopters in iNAV - see SET UP TAB ; Note that fixed wing can only fly forward so heading is derived from GPS data in All iNAV fixed wings) - For Quads - after pressing calibrate mag rotate the AIR3/Quad with GPS/Compass pod fitted by 360° in 3 axis X, Y and Z within 30 secs


Team CarbonBird™ iNAV FAQ © Frequently Asked Questions, and Answers

Where is the "Front" of the GPS/Compass? Answer = GPS has no front as such, but the compass is located inside the pod - the front is by default the wire-exit-side - so if you face the wires exit to East - the UI will show 90°. CW 270° flip. As long as you select "FLIP" you can face the GPS in any matching direction so CW Flip/CW 90° flip/CW 180° flip/CW 270° flip will all work, just confirm the direction in the Setup window to NORTH on a handheld compass.

Compass Position and Calibration is that essential? Answer = YES absolutely critical - The compass must be located 75mm away from ESCs, 75mm away from FPV Cam & Tx and wires which are not shielded - must be twisted. Mount the compass first (on velcro or 3M tape) then build the entire Quad and remove props - but be sure to connect the LiPo - then do Compass Calibration in UI SETUP tab.  in 30 secs rotate Quad 360° in X, Y and Z ; then goto Configuration TAB and enter your Magnetic Declination for your flying location based on the chart below (Red numbers are +ve and blue numbers are -ve)


Do i need to put my GPS on a lollypop stick?  Answer = No - absolutely NOT - this is a myth started by people whose airframes are poorly conceived, full of vibration/resonance, RMI and RFI - first up - We STRONGLY recommend you twist then route clear of servos, ESCs and the GPS lead  "Wires" and pod >75mm away from other devices like ESC, OSD, FPV cams, uBECs, motor wires and LiPo wires.  The GPS works in conjunction with a compass (in quads) and its usually the compass which is spiking due to RMI. However RFI can also be accidentally "injected" into un-twisted signal wires, such as GPS wires or I2C wires, creating very high signal/noise ratios in poor builds which ignore our wire routing advice above.  Whilst a stick might comply with the 75mm clear rule on a mini drone, it's a last resort - in mini Quads also ensure NAV wires are very carefully routed and twisted/shielded.  Best to twist wires with GND wire.

iNav Failsafe - Should i set Failsafe on my Rx or in iNav? Answer = Failsafe is a MODE setting in MODES tab of UI - If you have a digital Rx like X4R or X8R you should be sure to use and assign FAILSAFE rather than RTH as a mode in MODES tab; then in FAILSAFE TAB of UI - choose your preferred Failsafe action such as return to Land ; Take your prop off - and walk about 10-15m away from home point to test failsafe is working the way you expect when you turn the Taranis OFF/ON again  Be aware :-

  • Setting "failsafe_kill_switch = ON" will disarm you machine instantly when FAILSAFE mode is activated.
  • Failsafe will disarm instantly if your throttle was low for more than 10 seconds (default).
  • Failsafe RTH won't activate on airplanes when machine is closer that 5m (default) to home.
  • Failsafe RTH won't activate on airplanes without compass if prior to that there was no motion faster than 3 m/s (to acquire heading).
  • Failsafe will stay active after signal recovery until you move your Roll/Pitch stick.

How do i SAVE my iNAV settings after i made custom changes - What if i want to roll back to a setting from a few days ago? I want these as backups for later, or to send to a friend?  Answer = This is called a "CLi dump". with your Sirius™ AIR3 connected by USB goto the CLi Tab ; at the bottom type dump , return ; the screen will fill with data ; Use your mouse to select all the text ; COPY it - Create a folder on your PC/Mac ; Open a blank TextEdit Doc (plain text doc) ; Paste all the data into the blank text .txt file - (delete the top line "entering cli mode...) ; save each file with a smart name to allow Roll-back.    Later when you want to restore a Sirius AIR3 - goto the CLi TAB and paste all this "dump" text ; Return ; once it's finished scrolling down ; type SAVE - the AIR3 is now fully restored to the Roll-back data.

How do i save AIR3 data via my SPort FrSky data SDCard in my Taranis live? Answer =  - it very easy to collect and store live data at the the ground including GPS position data if the drone is lost - using Soft Serial (SS) on AIR3 and a 1KΩ resistor as per below.Inline image 1
Inline image 2

How do i see whats "Different" about my iNav settings ? Answer = in CLi TAB ; type diff or diff all       Diff all can also be used to backup to a text file but be sure not to include the defaults line at the top, only the rest

Can i use EZGUI and fly multi-point missions with Air3 iNav ?  Answer = Yes - 433/915Khz MavLinks will work fine - you must flash AIR3 1.7.1 (we have replaced the (gimmick) rgb/led functionality with Soft-Serial SS4 on these pins and use soft serial on UART4 (SoftSerial1) set to MSP 9600

 so Firmware 1.7.1 onwards disables RGB LED support and enables software serial port on last two pins of RC connector: Pins 7/8 , GND and 5v
| Pin | Function       | Notes                                |
| --- | -------------- | --------------------------------     |
| 1   | Ground         |                                      |
| 2   | +5V            |                                      |
| 3   | RX_PPM         | Enable `feature RX_PPM`              | 
| 4   | unused         |                                      | 
| 5   | USART2 TX      |                                      | 
| 6   | USART2 RX      | SBus                                 | 
| 7   | SS1 RX         | Enable `feature SOFT_SERIAL1`~MSP    |
| 8   | SS1 TX         |                   at 9600            |
Note that software serial ports work unreliably at baud rates higher than 19200 bps - so 9600 is fine. Then use EZGUI


What is the difference between the MWC Air3 M8N/Compass BLACK vs the WHITE version? Answer = The only difference is the MAG setting in UI ; for Black use 270°CW Flip ; for the White use 0°CW Flip  for mag 

Which UART port does the GPS use? Answer= the Serial GPS which is a uBlox M8N uses the side port marked "FLEX" which is UART3 in PORTS-Tab ; the GPS will not auto detect ; so the user must make sure his iNAV UI PORTs tab has UART3 selected to "ON" for GPS  ;
Is the Compass used for Quads? Answer = YES - the GPS pod also contains a 5883 ic2 Compass ;  it is critical as a Quad can fly facing any direction and travel in any other direction ;  the Green and Blue wires coming from the Compass are connected to the Rear Pins - see diagram for I2C SDA/SCL
How do i connect a TBS Crossfire Rx to AIR3 iNav - Please follow this tech note HERE
example of the AIR3 iNav fitted to a 240mm Scarab™ Knife - note battery is mounted low 

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Product Reviews

  1. iNav air3 for quadcopter - excellent customer support

    Posted by Matt Stahl on 25th Apr 2018

    I purchased an air3 for a 9-10" 450 size mapping quad and was very pleased with the ease of setup and plug-and-play. I do solder when needed but didn't trust myself to solder up a complete F3/F4 board. I setup my Sirius air3 board on one Saturday afternoon without too much trouble. Still need to do some PID tuning for my application. I'm coming from an APM/Pixhawk background and wanted to see if the "grass is greener" with inav. So far I'm very pleased - looking forward to getting my quad dialed in for auto missions.

    I did run into a few gotchas during my initial setup, and after I reached out to CarbonBird with specific questions they responded back with quick and very helpful feedback to help me troubleshoot and resolve the issue (unexplained throttle jump) that I was seeing. I've summarized my user setup errors/omissions below, in case they can be helpful to others setting up a quad:

    1. Set the range and center (sub trim) on the Transmitter while verifying on the GUI receiver tab. the CLi is used to do this. My throttle output for example was 988 to 2012 on the Receiver interface before adjustment. After adjustment it reads 1000 to 2000.
    2. Be sure to calibrate the Accelerometer BEFORE setting up any modes, ie in Acro mode. I recalibrated several times. My initial calibration was before modes, per the Wiki, but subsequent calibration I did after mode setup.
    3. Balance props - this is stated on Wiki and is of course always a good practice. This did not contribute to my throttle issue but did induce vibrations that inav seems especially sensitive to.

    Thanks CarbonBird for a great product - I will be back for more FC boards in the future!

  2. Bravo!!!!

    Posted by Matt Smith on 15th Oct 2017

    Super pleased with the iNav Sirius AIR3 F3 for Quads. This FC brought new life to my Flite Test Electrohub that has been sitting for three years. AIR3 Presets are nicely configured.

    In the future I would like to see features (built in OSD, current sensing, Voltage sensing, more uarts) on Sirius.

    Well done Team Multiwiicopter!

    REPLY from MWC: Thanks Matt - Glad you were able to fly well on our special default PIDs - AIR3 already has 4 x UARTS + AirspeedRef ; and already has Votltage sensing BATT pad on top side of board near USB plug - ; OSD = By keeping OSD separated we ensure 1) no interference (a major issue with other AIO brands) ; 2) that if the OSD is ever damaged via the Cam/Tx you wont need to buy the entire FC motherboard, only the OSD ; So we feel keep parts separated is a major advantage for FPV.

  3. iNav air3 is excellent

    Posted by Zac Johnson on 9th Jul 2017

    I have been using dji for a long time now and could never get it quite right. NAZA locks position OK when setup properly but that and being easy to set up is its only strong points.

    Well, as far as position hold goes for the air3, I would say it's just as good if not better... I haven't tested in strong wind yet just moderate conditions. Its vertical position hold is extremely good, better than NAZA actually. I can walk up to it and grab it and move it around and it will just move straight back to the exact position it was in.
    For Air3 - Don't forget, cable pointing forward, arrow to the rear, 270cw flip! Ignore what the iNav wiki says about the same gps module, the info above is more accurate.

    So AIR3 GPS mode is just a bonus. In hero mode (Acro) AIR3+GPS handles "amazing" - and I have only scratched the surface with PID tuning. In fact I'm a beginner when it comes to PIDs but it's really worth spending the time to master tuning and flying hero mode if you want to really master multirotor flying for real.
    Don't get sucked into the dji hype and advertising if you really want to fly. In the long run it's worth learning on iNav AIR3.

    Support from multiwiicopter.com is excellent.

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