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On December 15, 2020, at 19:48, "Timothy Collinson - timothy.collinson at port.ac.uk (via tml list)" <xxxxxx@simplelists.com> wrote:

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>- are there circumstances in which  more junior officer can be made XO (Executive Officer) over someone of a higher rank?  I.e. someone who is a regular part of the same crew?
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>(What particularly irked me about this was that they seemed to imply that the XO was some admin function outside of the chain of command and actually had two lines about precedence in which they agreed it wouldn't affect the senior's overall seniority.  If they'd just left those two lines out I might have bought it)
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A bunch of this is what does your duty roster look like?

In general the XO like the Captain are chosen by the powers that be. It isn't too uncommon for both of them to have the same rank.