Navigation transit markers
- Navigation transit markers
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Principle of using navigation transit markers to check speed
Pair of markers at Kingston
Navigation Transit Markers are posts placed alongside a navigation to allow powered craft to check their speed. There are examples along the River Thames in England.
A navigation marker consists of a black and white ringed pole surmounted by a red open triangle. The configuration of the markers is made up of two pairs, each pair having one pole behind the other, and the pairs being separated by a set distance along the bank. Timing starts when the first two markers line up, and ends when the second pair line up. For a craft to be within the speed limit, it should take a minute or more to reach the second pair of markers after passing the first pair of markers. On the upper reaches of the Thames, the speed limit is 8 km per hour or 133.3m per minute, and so the markers are set 133.3m apart.
On the River Thames, there are markers on the reaches above Teddington Lock, Sunbury Lock, Cookham Lock, Sonning Lock, Day's Lock and Osney Lock.
See also
 |
UK Waterways portal |
- Locks on the River Thames
References
Categories:
- Water transport in England
- Geography of the River Thames
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NAVIGATION (SYSTÈMES DE) — Naviguer consiste, au sens originel, à se déplacer ou à voyager sur l’eau. Par extension logique, ce terme qualifie également l’art et la science de conduire un navire. Ultérieurement, la notion de navigation s’est étendue aux domaines aérien,… … Encyclopédie Universelle
navigation — navigational, adj. /nav i gay sheuhn/, n. 1. the act or process of navigating. 2. the art or science of plotting, ascertaining, or directing the course of a ship, aircraft, or guided missile. [1520 30; < L navigation (s. of navigatio) a voyage.… … Universalium
Osney Lock — Osney Lock[1] Osney Lock and derelict Osney Mill buildings from the south … Wikipedia
Teddington Lock — Infobox Waterlock lock name = Teddington Lock [ [http://www.visitthames.co.uk/uploads/a users guide to the River thames.pdf Statistics from Environment Agency A User s Guide to the River Thames:Part II ] ] caption= Teddington Lock undergoing… … Wikipedia
Day's Lock — Day s Lock[1] Sculler waits to enter Day s Lock while a cruiser tries to come out sideways … Wikipedia
Sonning Lock — Infobox Waterlock lock name = Sonning Lock [ [http://www.visitthames.co.uk/uploads/a users guide to the River thames.pdf Statistics from Environment Agency A User s Guide to the River Thames:Part II ] ] caption= Sonning Lock from downstream… … Wikipedia
Cookham Lock — Cookham Lock[1] Cookham Lock, Berkshire … Wikipedia
Sunbury Lock — Infobox Waterlock lock name = Sunbury Lock [ [http://www.visitthames.co.uk/uploads/a users guide to the River thames.pdf Statistics from Environment Agency A User s Guide to the River Thames:Part II ] ] |thumb|right|] caption = Sunbury lock with… … Wikipedia
Desborough Cut — from one of the bridges The Desborough Cut is an artificial channel in the River Thames above Sunbury Lock near Walton on Thames in England. It which was completed in 1935 to improve flow and ease navigation on the river. The cut was dug between… … Wikipedia
River Thames — Thames redirects here. For other uses, see Thames (disambiguation). Coordinates: 51°29′56″N 0°36′31″E / 51.4989°N 0.6087°E / 5 … Wikipedia
