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navigation - What are the differences between an OBS, a CDI, a Heading indicator, and an HSI? - Aviation Stack Exchange
MSFS - Using OBS mode on the G1000. (AH QL 4) - YouTube
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New approach-capable GPS navigator in X-Plane 10.30 - X-Plane Developer
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A Flight Instructor's Journal: 2007
e-obs GPRS High-Res (42g+) — Vertebrate Systems, LLC
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How to make and use Virtual VORs - Helicopter Training Videos (HTV)
