The portion of a mechanism that utilizes manual positioning, or automatic indexing, is known as a detent. An example of a detent used aboard ship can be found in a/an __________.

In USCG Marine Engineering General Subjects, for engine room systems involving 'The portion of a mechanism that utilizes manual positioning, or automatic indexing, is known as a detent. An example of a detent used aboard ship can be found in a/an', the standard operating requirement is: 'engine order telegraph'.