What it means
The G center carries identity, direction and love. When it connects straight to the Throat and nothing lower in the body is the authority, the truth comes out in speech. A Self-Projected person often doesn't know what they think until they hear themselves say it. The question isn't "is this logical?". It is closer to "does this sound like me, and does it take me in the right direction?".
How to use it
Talk the decision out with someone you trust, and ask them not to give advice. You aren't looking for their opinion. You are listening to the tone of your own voice and which option makes you sound most like yourself. Talking to yourself out loud, or recording a voice note, can work too.
Who has it
Only Projectors can have Self-Projected authority. It needs a defined G center connected to the Throat, with the Solar Plexus, Sacral, Spleen and Heart all undefined.
Common mistakes
Asking for advice instead of a listener, deciding silently in your head, following the listener's reaction instead of your own voice, and choosing what sounds impressive rather than what sounds like you.
How Cosmic Array reads it
Your authority depends on which centers are defined in your bodygraph. Cosmic Array works that out from the positions of 13 bodies at your birth and again about three months before it, calculated with the Swiss Ephemeris, and shows your authority next to your type, strategy and profile in the Architect blueprint. The Moon moves fast, so a birth time helps. Without one, the blueprint uses noon and marks the result as approximate.