Does your iPhone have to be on to track it?

I recently lost my phone at a football game, I tried to call it and it goes strait to voicemail. I've also tried the app called "find my iPhone" but it says my phone is offline and could not find it's location.

Does my phone have to be on to be able to track it?

Yes it has to be.

Of course, it has to be ON to track it.

Yes it has to be on.