Crossword Genius

Navigational aid going up or down (5)

Ross

I believe the answer is:

radar

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'navigational aid' is the first definition.
(I've seen this in another clue)

'up or down' is the second definition.

'going' is the link.
This may not be right. It may belong to one of the definitions.

Can you help me to learn more?

(Other definitions for radar that I've seen before include "System for locating distant objects" , "Range-finding and detection system" , "Electronic rangefinder" , "Kind of gun" , "Locator that uses a microwave echo" .)

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.