You are 100% correct. Scanners deploy when you use them (also supercruise) so your sensor blip becomes a hollow triangle. If you select 'retract weapons' your blip becomes a hollow square again.
Sorry, but thats just a myth.
In normal space the icon turns to a triangle if you deploy hardpoint. Everyone knows that. But you can't deploy hardpoints in supercruise.
So what causes the icon to switch to a triangle in supercruise?
"
Deploying an interdictor or using a scanner" is the normal answer that you will get here. But this answer is wrong. A myth. And I can prove it.
I tried it out 5 minutes ago, just to see if anything has changed since the last time I did this. I've got multiple accounts, so I can observe myself.
Andf I can tell you:
-Deploying an interdictor does not turn you a triangle
-Deploying any scanner in the game does not turn you a triangle
-Switching Cockpit modes does not
-Using the FSS does not
-Honking does not
-Firing surface probes does not
-Scanning the whole system does not
The only thing that causes you to turn triangle is actually using the interdictor
So why are ships that are not interdicting, and often dont even have an interdictor on board, show as a triangle every now and then?
Its a bug. Pure and simple.
And that was the point of my post up there.