Admiralty code

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The Admiralty Code system is a two-character notation used by military intelligence organisations to record the reliability and accuracy of a piece of information.

  • Reliability of Source
A - Completely Reliable
B - Usually Reliable
C - Fairly Reliable
D - Not usually Reliable
E - Unreliable
F - Cannot be judged
  • Accuracy of data
1 - Confirmed by other sources
2 - Probably True
3 - Possibly True
4 - Doubtful
5 - Improbable
6 - Truth cannot be judged

Hence, a statement coded A1 would be the best possible, meaning it was from a completely reliable source and the information was confirmed by other sources.