Beeping Thing

I can't figure out what this beeping thing was that I encountered the other
day while flying a 172 from our club. I'm a fresh private and I took my
parents to Mansfield airport for Sunday morning breakfast. When we left on
runway 14 This beeping thing came on. I think it's a DME. I've seen one in
use before, but I couldn't figure it out and it scared my mother half to
death, (She thought it was a sound that meant the engine was about to die).
How do I turn it off? This plane is equipped with the standard NAV/COM, it
has an ADF and Garmin GPS with moving map. I tried Flipping all kinds of
switches to turn it off and I couldn't figure it out. I knew it was a marker
of sorts, so I knew it would go away, I just hoped it would go away fast to
ease everyone anxiety. Any tips on how to turn it off?



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