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Transmission power ranges between 1 and 25 watts, giving a maximum range of up to about 60 nautical miles (111 km) between aerials mounted on tall ships and hills, and 5 nautical miles (9 km; 6 mi) between aerials mounted on small boats at sea level. [7]
Very high frequency (VHF) is the ITU designation [1] for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as ultra high frequency ...
2182 kHz is analogous to channel 16 on the marine VHF band, but unlike VHF which is limited to ranges of about 20 to 50 nautical miles (40 to 90 km) depending on antenna height, [3] communications on 2182 kHz and nearby frequencies have a reliable range of around 50 to 100 nautical miles (90 to 190 km) during the day and 150 to 300 nautical miles (280 to 560 km) or sometimes more at night.
A similar broadcast on MF is initially announced on 2182 kHz, with a further frequency specified, e.g., 1770 kHz. VHF optimum range is approximately 30 nautical miles (nmi), effectively line of sight, whereas MF range is much greater at approximately 150 nmi, allowing ships in the Atlantic Ocean and North Sea to receive the broadcast.
The U.S. National Distress System was established in the early 1970s [1] as a VHF-FM-based radio communication system that has a range of up to 20 nautical miles (40 km) along most of the U.S. shoreline for the United States Coast Guard.
The Keller Ferry carries State Route 21 across Lake Roosevelt on the upper Columbia River between the Colville Indian Reservation and Clark. It is operated by WSDOT and was the first ferry operated by the state of Washington. [5] The Guemes Island ferry from Anacortes 5 minutes north to Guemes Island is operated by Skagit County, Washington. [6]
The ferry system carried a total of 18.66 million riders in 2023—9.69 million passengers and 8.97 million vehicles. [3] WSF is the largest ferry system in the United States and the second-largest vehicular ferry system in the world behind BC Ferries. [4] The state ferries carried an average of 59,900 per weekday in the third quarter of 2024.
Elliott Bay is a part of the Central Basin region of Puget Sound. It is in the U.S. state of Washington , extending southeastward between West Point in the north and Alki Point in the south. Seattle was founded on this body of water in the 1850s and has since grown to encompass it completely.