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How long is 473 fathoms?

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It's about 60 times as long as a Semitrailer.
In other words, 473 fathoms is 59.13 times the length of a Semitrailer, and the length of a Semitrailer is 0.01691 times that amount.
(a.k.a. semi-trailer truck, a.k.a. semi, a.k.a. tractor-trailer, a.k.a. truck and trailer, a.k.a. eighteen-wheeler, a.k.a. big rig, a.k.a. Mack truck, a.k.a. transport, a.k.a. lorry, a.k.a. artic; for box truck; United States Federal length limits)
According to the United States Department of Transportation (DOT), the maximum allowable length of a semitrailer pulled by a road tractor truck is 8 fathoms (unless superseded by state law). These regulations also allow the vehicles to tow up to 36,000 kg in gross weight.
It's about 65 times as tall as a Brachiosaurus.
In other words, the height of a Brachiosaurus is 0.015 times 473 fathoms.
(based on comparable bone measurements, height to head)
Dinosaurs in the genus Brachiosaurus had an estimated height (at the head with neck fully extended) of up to 7.1 fathoms. A resin cast of the first Brachiosaurus specimen, owned by the Field Museum in Chicago, is currently on display at the O'Hare International Airport.
It's about 80 times as tall as a Telephone Pole.
In other words, 473 fathoms is 79 times the height of a Telephone Pole, and the height of a Telephone Pole is 0.013 times that amount.
(a.k.a. Utility Pole, a.k.a Power Pole, a.k.a. Telegraph Pole, a.k.a. Telegraph Post, a.k.a. Hydro Pole) (exposed height; per Florida Public Service Commission average)
A standard telephone pole is 6 fathoms tall. Despite alternatives, most telephone poles in the US are made of wood — most commonly pine — and have a lifespan of 25 to 50 years, depending on climate and preservatives applied.
It's about 100 times as tall as a Giraffe.
In other words, the height of a Giraffe is 0.01 times 473 fathoms.
(Giraffa camelopardalis) (Adult, average)
An adult giraffe may grow to be up to 3 fathoms tall. Adult giraffes require very little sleep, averaging just 1.9 hours per day.
It's about one-one-hundredth as long as The Panama Canal.
In other words, 473 fathoms is 0.0098 times the length of The Panama Canal, and the length of The Panama Canal is 100 times that amount.
(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 48,000 fathoms in length. Ships passing through the Canal are raised (and then lowered) 14 fathoms above sea level through the lock-and-dam system.
It's about 100 times as long as a London bus.
In other words, 473 fathoms is 103 times the length of a London bus, and the length of a London bus is 0.00971 times that amount.
(Routemaster Double-Decker, RM standard specification)
The Routemaster Double-Decker buses, well-known as icons of London, measure 4.58 fathoms in length. The buses were said to be well-designed for travel in the London traffic, as they offered an open door for riders to board and exit even while the bus was moving at low speeds, and a full-time conductor to collect fares.
It's about one-one-hundredth as long as The English Channel.
In other words, 473 fathoms is 0.00808 times the length of The English Channel, and the length of The English Channel is 124 times that amount.
(average width between Isle of Ushant and The Walde Lighthouse) (La Manche, Ärmelkanal, Mor Breizh, Mor Bretannek) (a.k.a. The Channel)
The English Channel measures between 58,500 fathoms, narrowing as it flows northeast. The world speed record for a Channel crossing by swimmer was set by Australian Trent Grimsey in 2012, with a time of 6 hours, 55 minutes.