Organizationally (as in, getting sessions to run) the GM is usually Captain.
But otherwise... my usual thought is that the GM is more like a vacation planner. You come in, and the GM gives you several options of things to do. Sometimes it is a complete package with everything scheduled out for you. Other times, it's pretty loose - you pick a destination, and you work out some of the travel arrangements and places to stay, but otherwise you're free to wander on your own. A really good planner will work with you to find out which is right for you.
But otherwise... my usual thought is that the GM is more like a vacation planner. You come in, and the GM gives you several options of things to do. Sometimes it is a complete package with everything scheduled out for you. Other times, it's pretty loose - you pick a destination, and you work out some of the travel arrangements and places to stay, but otherwise you're free to wander on your own. A really good planner will work with you to find out which is right for you.
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