In the movie, First Man (2018), Neil Armstrong is getting into Gemini 8 space craft. He overhears capcom voice:

CARNARVON CAPCOM: Guaymas, read you loud and clear. We have S band track. We have just locked up on T.M.

What is the meaning of "T.M"?

  • $\begingroup$ It won't help for Gemini-specific questions, but the annotated Apollo flight journals explain a lot of the jargon of the period. You might enjoy them. $\endgroup$ – Russell Borogove Feb 18 '19 at 22:14

Most likely Telemetry.


Although usually TLM is used.

The "locking" terminology is explained here : What is carrier lock and bit lock?


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