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| Acronym | Full form | |
|---|---|---|
| Acronym: DME | distance measuring equipment | est|flight testing]]. For land-based operations, the initial systems used very high frequency omnidirectional radio range (VOR) and distance measuring equipment (DME) for estimating position; for oceanic operations, inertial navigation systems (INS) were employed. Airspace and [[Minimum obstacle clearance altitude|obstacle clearance] |