TYPES OF MESSAGES

*CODH, or DHCO – Company deadhead message refer to traffic
licenses, repairs, supplies etc.. exchanged by radio between ships and
offices of the same radio service. There are charges.
*DH, or PDH- These complimentary franked messages may require
payment of only the landline charge, the ship and coastal charges being
frank card.
*DH MEDICO – Deadhead medical messages are free (deadhead)
messages pertaining to medical or surgical advice for persons aboard a
ship and are normally addressed to marine Hospital in a city served by the
coastal station receiving them.
*DH or OPR – Operator deadhead messages are personal message of
radio officers and may be forwarded through the coast stations of the same
radio service subject to only landline charges.
*GOVT – Government radiograms by accredited officials on official
government business are charged full rates.
*MSG – Master’s messages ate from masters of vessels and pertain
to ship’s business. Only coastal and landline charges are collected.
*OBS – Observer messages are meteorological reports from ship at
sea to Weather bureau. There are no charges insofar as the ship operator
is concerned.