M/V,m.v.=motor vessel
    N=and
    N/A=nonacceptance
    NAR=now arriving
    NV,N.B.nota bene(note well)
    NEC,NEGTN=negotiation
    NEGO=negotiate
    NIL=noting
    NITE=night
    NLT=not later than
    NNNN=end of massage signal
    NO,NBR,NR=number
    NOV=November
    N.R.T.=net registered tonnage
    NTD=noted
    NU=new
    N/W,NTWT,NWT=net weight
    NXT=next
    NY=New York
    NZ=New Zealand