English to Spanish Other Ships, Sailing, Maritime Naval Form Terminology

Hello guys, I´ve got a lot of questions so, I´ll go straight to the point in each.

The context:
A military form where the events that took place during a vessel interdiction at sea are explained. The language structure is military - short sentences, lots of acronyms and naval terms, used in order to be very brief in the narrative.

The sentence/terms (target expression in quotation marks and caps):
ENS Smith relieved the deck and "CONN" under the instructions of LTJG Hopkins.

My try:
EL alférez Smith relevó la cubierta y CONN bajo las instrucciones del Teniente de Corbeta Hopkins.

What on earth is CONN in this context?

Gracias.