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Old 20th May 2016, 04:02
  #10 (permalink)  
Uplinker
 
Join Date: Nov 1999
Location: UK
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Yer, as Aerocat says, the RAD ALT is a RADAR like system. Both use radio waves to determine the range of an object, (in this case, the ground).

Actual RADAR measures the direction too, whereas the RAD ALT only looks in one direction - downwards.
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