How do I place my ship in the equator of a planet?

Question

I sent a ship to Duna.

How do I check or know if my ship is orbiting the equator of that body?

I do know how to orbit a body. I want to know specifically about orbiting the equator.

Note: I don't want to install Kerbal Engineer Redux since a good amount of the useful features were already integrated to the game.

Answer 1

Here is a solution without using any mod: 1- Click on the button pointed by the blue arrow. It's the Maneuver Mode 2- Click on the button pointed by the green arrow. It's the Advanced orbital info

When the inclination is 0 (zero), you are orbiting the equator.