I'm a newly certificated CFI, (unemployed, unfortunately) will be receiving my CFII soon, and would like to obtain a gold seal in the future. As stated by AC61-65E (part 21(b)), a CFI needs to have an Advanced Ground Instructor (AGI) or Instrument Ground Instructor (IGI) certificate as one of the requirements in order to qualify. For the record, I currently hold an IGI.
Now I know that a CFI/CFII in effect, holds a Basic Ground Instructor (BGI) certificate, and is authorized to do said privileges as specified in 14 CFR §61.215(a).
The only thing I can gather between 14 CFR §61.215(a) and 14 CFR §61.215(b) is that a BGI is limited to sport, recreational, or private pilots, while an AGI is "for any certificate." Other than that, I am not clear on deciphering the regulations. It seems to me that an AGI/IGI does not even need to be a pilot in order to qualify, unless I'm missing something. In addition, a CFI and CFII certificate expire, whereas an AGI and IGI do not. When trying to see what an IGI can do verses what a CFII can do, I can't really see any advantage of an IGI over a CFII.