Calibrating the accelerometer in INAV is a bit different from Cleanflight and Betaflight. INAV uses a 6 step calibration. Here is how to do it.
Omnibus F3 clone - http://www.banggood.com/Betaflight-F3-AIO-V1_1-Flight-Controller-with-Integrated-OSD-p-1086563.html?p=3827048207257201612A
Omnibus F4 clone - http://www.banggood.com/Betaflight-F4-Flight-Controller-STM32-F405-MCU-Integrated-OSD-p-1103940.html?p=3827048207257201612A
INAV playlist - https://www.youtube.com/playlist?list=PLiYYhnH4BhI8DKSj5LLo2U7y5bTdqAZr1
All my playlists - https://www.youtube.com/channel/UCObMtTKitupRxbYHLlwHE3w/playlists
Video editor - http://amzn.to/2n7sUiF
My personal vlog channel - http://www.youtube.com/c/JcOfficial3
