What is the difference between Ground Risk Class (GRC) and Air Risk Class (ARC)?

GRC (Ground Risk Class) measures the potential consequence of a UAS impact on people on the ground.

ARC (Air Risk Class) measures the likelihood of an encounter with manned aircraft.

GRC is a consequence measure; ARC is a frequency/exposure measure. Both can be reduced through targeted mitigations before the final SAIL level is determined.

For more details on SAIL levels, read our in-depth guide.

Related Questions

Is a SAIL level the same as an approval?
No, it is not.
What SAIL level do I need for BVLOS operations?
There is no fixed SAIL level for BVLOS. The level depends on where you fly, the size of your aircraft, and what mitigations are in place.
Can I reduce my SAIL level?
Yes you can, through mitigations.