"DTF" stood for "Delta Transmission Frequency," a highly classified channel used for strategic communications between various military and governmental agencies. The "-23.08...." was a specific frequency modulation, unique to that channel.
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: This acronym could stand for several things, but common interpretations include "Down To F*ck" in informal contexts or "Distance To Fix" in technical or GPS-related contexts. Given the inclusion of a coordinate or datum ("-23.08...."), it's plausible that "DTF" here refers to a technical measurement or status indicator related to GPS or navigation. MyGF - Bailey Base - Bailey Base is DTF -23.08....