IMU (inertial measurement unit)
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The IMU's job is to assist with orientation, pitch and roll. It helps immensely with accuracy in a single-GPS configuration, so much that you could say it is mandatory, but it's not needed if you're going dual-GPS. You can use it in dual as well tho, it won't hurt.
The BNO085 is the one to go for - no other is as good. The Adafruit is popular, but if you look at any kind of alternative, the pins have to be in the same configuration - so play it safe and stick with this. These can be hard to find, so watch the Discourse or Telegram channels as helpful members often post when they see stock at $VENDOR.
