Ground Instructor
BelArg made that ground instructor thing sound too easy. What he forgot to mention was:
1. You must make your application for the certificate at the FSDO. (Part 1 of your non-existent oral)
2. There's a recency of experience (3 months as a ground instructor in the past 12 months) and/or endorsement (from a qualified ground or flight instructor) required to exercise the privileges of the certificate (same as the pilot certificates with their non-expiring nature). (Part 2 of your non-existent oral).
3. Any sim training you provide may NOT be used to comply with any flight currency or rating requirements where the use of a simulator is authorized. Only a qualified flight instructor may provide/endorse that training.
I've never heard of any 61, 141, or 142 operator using someone with a ground instructor certificate only to provide sim training. The only exception, by reg, would be if the sim was part of a 121 training operation, and the instructor was a typed ATP.