Oh, silly me, GPS of course...

From: Chuck McCown 
Sent: Thursday, February 18, 2021 3:37 PM
To: af@af.afmug.com 
Subject: OT Helicopter on Mars

I wonder how it navigates.  I presume a barometric altimeter will work there.  
But how would they get bearing and distance from the ground vehicle?  You could 
use a Doppler antenna array to get a bearing I suppose.  And maybe some kind of 
DME for distance.  Like to see a write up on that.  
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