Sec. 80.511  Assignment limitations.

    (a) Only one port operation, one commercial and one non-commerical 
frequency will be assigned to a private coast station or marine utility 
station. Applications for authority to use more than one frequency in 
any one of the above three categories must include a showing of need as 
specified below.
    (b) An application for an additional frequency by a person who 
services vessels, must include a description of the vessels with which 
communication is planned and a statement that the applicant has personal 
knowledge that the ship radio stations are not capable of operating on 
working frequencies already assigned to the coast station.
    (c) An application for an additional frequency based on congestion 
of the assigned frequency must show that for any four periods of 5 
consecutive days each, in the preceeding 6 months, the assigned 
frequency was in use at least 25 percent of the time during 3 hours of 
daily peak activity. If the application for an additional frequency is 
based on the congestion by other nearby stations, the showing must 
include the call signs and locations of such stations.