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4: Use of 156.875 MHz is limited to communications with pilots regarding the movement and
docking of ships. Normal output power must not exceed 1 watt.
5: 156.375 MHz and 156.650 MHz are available primarily for intership navigational
communications. These frequencies are available between coast and ship on a secondary
basis when used on or in the vicinity of locks or drawbridges. Normal output power must not
exceed 1 watt. Maximum output power must not exceed 10 watts for coast stations or 25 watts
for ship stations.
6: On the Great Lakes, in addition to bridge-to-bridge communications, 156.650 MHz is
available for vessel control purposes in established vessel traffic systems. 156.650 MHz is
not available for use in the Mississippi River from South Pass Lighted Whistle Buoy “2” and
Southwest Pass entrance Midchannel Lighted Whistle Buoy to mile 242.4 above Head of
Passes near Baton Rouge. Additionally it is not available for use in the Mississippi River-Gulf
Outlet, the Mississippi River-Gulf Outlet Canal, and the Inner Harbor Navigational Canal,
except to aid the transition from these areas.
7: Use of 156.375 MHz is available for navigational communications only in the Mississippi River
from South Pass Lighted Whistle Buoy “2” and Southwest Pass entrance Mid-channel
Lighted Whistle Buoy to mile 242.4 above head of Passes near Baton Rouge, and in addition
over the full length of the Mississippi River-Gulf Outlet Canal from entrance to its junction with
the Inner Harbor Navigation Canal, and over the ull length of the Inner Harbor Navigation
Canal from its junction with the Mississippi River to its entry to Lake Pontchartrain at the New
Seabrook vehicular bridge.
8: Within 120 km (75 miles) of the United States/Canada border, in the area of the Puget Sound
and the Strait of Juan de Fuca and its approaches, 157.425 MHz is half of the duplex pair
designated as Channel 88. In this area, Channel 88 is available to ship stations for
communications with public coast stations only. More than 120 km (75 miles) from the United
States/Canada border in the area of the Puget Sound and the Strait of Juan de Fuca, its
approaches, the Great Lakes, and the St. Lawrence Seaway, 157.425 MHz is available for
intership and commercial communications. Outside Puget Sound area and its approaches
and the Great Lakes, 157.425 MHz is also available for communications between commercial
fishing vessels and associated aircraft while engaged in commercial fishing activities.
9: When the frequency 156.850 MHz is authorized, it may be used additionally for search and
rescue training exercises conducted by state or local governments.
10: The frequency 156.850 MHz is additionally available to coast stations on the Great Lakes for
transmission of scheduled Coded Marine Weather Forecasts (MAFOR), Great Lakes
Weather Broadcast (LAWEB) and nscheduled Notices to Mariners or Bulletins. F3C and J3C
emissions are permitted. Coast Stations on the Great Lakes must cease weather broadcasts
which cause interference to stations operating on 156.800 MHz until the interference problem
is resolved.
11: The frequency 157.100 MHz is authorized for search and rescue training exercises by state
or local government in conjunction with U.S. Coast Guard stations. Prior U.S. Coast Guard
approval is required. Use must cease immediately on U.S. Coast Guard request.
12: The duplex pair for channel 20 (157.000/161.600 MHz) may be used for ship to coast station
communications.
13: Available for assignment to coast stations, the use of which is in accord with an agreed
program, for the broadcast of information to ship stations concerning the environmental
conditions in which vessels operate, i.e., weather; sea conditions; time signals; notices to
mariners; and hazards to navigation.
14: Available only in the Puget Sound and the Strait of Juan de Fuca.
15: The frequency 156.525 MHz is to be used exclusively for distress, safety and calling using
digital selective calling techniques. No other uses are permitted.
16: The frequency 156.450 MHz is available for intership, ship and coast general purpose calling
by noncommercial vessels, such as recreational boats and private coast stations.
17: The frequency 156.425 MHz is assigned by rule to private coast stations in Alaska for
facsimile transmissions as well as voice communications.
