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. $\endgroup$ Feb 18, 2019 at 22:14

1 Answer 1


Most likely Telemetry.


Although usually TLM is used.

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


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.