Two Letter Signals
International Code of Signals

AE I must abandon my vessel.
CJ Do you require assistance?
CN I am unable to give assistance.
JI Are you aground?
JL You are running the risk of running aground.
JW I have sprung a leak.
KN I cannot take you in tow.
LN Light ( name here) is not functioning.
LO I am not in my correct position ( used by a lightship)
LR Bar is not dangerous.
LS Bar is dangerous.
MF Course to reach me is....
MG You should steer course....
NF You are running into danger.
NG You are in a dangerous position.