What do the three call levels mean?

They describe how urgent things are for you right now, and how close the occasion has already come. They are not a price list and they are not packages. What you book emerges later, out of the conversation.

Level	Call	When you call this way
Routine	ordinary call	In good time before the season, calm and with a plan. The occasion lies in the future, you have time to build it properly. The winter break belongs here too.
Raised	PAN-PAN	There is pressure. You have realised you want to work on your head, and the occasion is coming closer. An enforced break after an injury is a classic PAN-PAN moment as well.
Highest	MENTAL MAYDAY	You feel considerable pressure, and the occasion is practically at the door. You want to act now.

Honestly, the three levels are above all a self-assessment. They help us judge how much time is left. And they help you admit to yourself where you stand.

The best call is the ordinary one. Whoever calls early has a free choice.