Remove AGL Remove Threshold Remove VOR
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I Am UNSAFE Checklist—Lessons Learned on a Fateful Night

Air Facts

The weather was challenging, but quite flyable, until just before the JOT VOR, which was the outer marker on the ILS2L approach. The ATIS called out the overcast at 800 AGL, the minimum I needed (mistake #5not mine, but it counted anyway.) As I crossed the runway threshold, it was solid IMC and I had to go missed.

Ceiling 81
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RNAV Approaches Simplified: A Guide for New Pilots

Pilot Institute

Before RNAV, pilots had to rely on radios (NAVAIDs) and antennas on the ground such as VORs (Very High-Frequency Omnidirectional Range) and NDBs (Non-Directional Beacons). Theyre pretty much the same thing, but heres the difference: DH is measured above the ground (AGL). DA is measured above sea level (MSL).