- published: 26 Jan 2016
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Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. GMT was formerly used as the international civil time standard, now superseded in that function by Coordinated Universal Time (UTC). Today GMT is considered equivalent to UTC for UK civil purposes (but this is not formalized) and for navigation is considered equivalent to UT1 (the modern form of mean solar time at 0° longitude); these two meanings can differ by up to 0.9 s. Consequently, the term GMT should not be used for precise purposes.
Because of Earth's uneven speed in its elliptical orbit and its axial tilt, noon (12:00:00) GMT is rarely the exact moment the sun crosses the Greenwich meridian and reaches its highest point in the sky there. This event may occur up to 16 minutes before or after noon GMT, a discrepancy calculated by the equation of time. Noon GMT is the annual average (i.e., "mean") moment of this event, which accounts for the word "mean" in "Greenwich Mean Time".
A great circle, also known as an orthodrome or Riemannian circle, of a sphere is the intersection of the sphere and a plane which passes through the center point of the sphere. This partial case of a circle of a sphere is opposed to a small circle, the intersection of the sphere and a plane which does not pass through the center. Any diameter of any great circle coincides with a diameter of the sphere, and therefore all great circles have the same circumference as each other, and have the same center as the sphere. A great circle is the largest circle that can be drawn on any given sphere. Every circle in Euclidean 3-space is a great circle of exactly one sphere.
For most pairs of points on the surface of a sphere there is a unique great circle through the two points. The exception is a pair of antipodal points, for which there are infinitely many great circles. The minor arc of a great circle between two points is the shortest surface-path between them. In this sense the minor arc is analogous to “straight lines” in Euclidean geometry. The length of the minor arc of a great circle is taken as the distance between two points on a surface of a sphere in Riemannian geometry. The great circles are the geodesics of the sphere.
How to measure distance on a nautical chart.
This video is part of the online captain’s license course offered by US Captains Training. It is used in conjunction with classroom training and offered to the world for free via YouTube. The video goes over Distance, Speed, and Time Overview in the chart navigation section of US Captain’s Training’s Online Master Captain’s license course.
Answer to Navigation question 10 - Use dividers to on the Timor Sea chart below to find the distance in nautical miles between : a) the peak on Moa and the northern lighthouse on Wetar b) the lighthouses on Kisar and Lakor c) Recon light and the peak on Babar
How to measure distance on a chart and work out the time it will take to travel. Nautical navigation. Watersports training
You can obtain a fix by combining two or more distances or distances and compass bearings. This is how you plot a fix position combining two or more distances: Let's assume you sail near the coast. The radar is in good working condition and in operation. Taking into account your last position, and after comparing the nautical chart's coast line with that on the radar screen, you spot two points on the screen, A and B, from where you can take distances. The equivalent ones on the nautical chart are points A and B. Using the radar's range marker you measure a distance of 5.2 nautical miles from point A, and 2.8 nautical miles from point B. You note the time - let's assume it is 0930 hours. Then return to the nautical chart, and using the dividers, span a distance of 5.2 nautical mil...
Answer to Navigation question 10 - Use dividers to on the Timor Sea chart below to find the distance in nautical miles between : a) the peak on Moa and the northern lighthouse on Wetar b) the lighthouses on Kisar and Lakor c) Recon light and the peak on Babar
Part 5 really starting to take shape. Here's a short list of Airport to airport codes and distances. Remember, the distances are based on a ball shape earth, but even though the earth is flat, those distances are still relative and therefore useful. SYD to USH 5877 miles (9458 kilometers, 5107 nautical miles). http://www.airmilescalculator.com/distance/syd-to-ush/ DEL New Delhi to MAA 1096 miles (1764 kilometers, 953 nautical miles). DEL to CGK Jacarta 3105 miles (4997 kilometers, 2698 nautical miles). CGK to SYD. 3433 miles (5525 kilometers, 2983 nautical miles). MAA to CGK 2249 miles (3620 kilometers, 1955 nautical miles). MNL Manila to CGK 1734 miles (2791 kilometers, 1507 nautical miles). MNL to SYD. 3896 miles (6269 kilometers, 3385 nautical miles). DEL to MNL HKG H...
In celestial navigation, "lunar distance" is the angle between the Moon and another celestial body. The "lunar distances method" uses this angle, also called a "lunar", and a nautical almanac to calculate Greenwich time. By comparing that calculated time to the measured local time, the navigator can determine longitude. The method was used for some time during the 17th century, before the introduction of the marine chronometer. A similar method uses the positions of the Galilean moons of Jupiter. In celestial navigation, knowledge of the time at Greenwich and the measured positions of one or more celestial objects allows the navigator to calculate latitude and longitude. Reliable marine chronometers were unavailable until the late 18th century and not affordable until the 19th century....
This is how we plot a Running Fix Position: Assuming the course is 080° degrees and the speed is 8 knots, or 8 nautical miles per hour, we take a bearing of 045° degrees on Alfa rock at 0900, now convert the compass bearings to true bearings and we plot it on the chart. After 30 minutes we take a new bearing on the same rock that reads 015°degrees, now convert the compass bearings to true bearings and plot it on the chart along with the new time - 0930. Knowing the speed, the next step is to determine the distance that the vessel sailed from 0900 to 0930. For that we use the formula: D is equal to S times T divided by 60, where D is the distance in nautical miles, S is the boat speed, and T is the time in minutes. In our case: 8 knots times 30 minutes divided by 60 equals 4 nautic...
In this video we discuss the relationship between the size of the earth and the nautical mile. A nautical mile is equal to one minute of latitude, which is equivalent to one sixtieth of a degree of latitude. If we know the circumference of the earth, we can find the length of a nautical mile.
http://www.freemathvideos.com In this video playlist you will learn how to graph the trigonometric functions for sine, cosine, tangent, cotangent, secant, and cosecant. You will learn how to identify the amplitude, period, phase shift, vertical, horizontal, translation, transformation, reflection, of the graph. Next we will explore the inverse of functions to find the angle when given a function.
Yes looks like sships dont like southern ocean seem to go nth then south The yatch map tells all
How do you measure a distance that is longer that the span of your dividers? Assume that you are sailing from point A to point B. The true course is 110°, and you want to know how many nautical miles it is from A to B. However, the distance to be measured is greater than the divider's span. Use the dividers and span a distance of 10 miles on the latitude scale which is closest to point A and B. Walk the dividers along the course as many times as needed until you get close to point B, and mark the last point as point X. In our case we need to walk the dividers three times. That makes 3 times 10 miles, equalling 30 miles. Now measure the distance from point X to point B and apply this span on the latitude scale which is closest to point B. On the scale you find that in this case the dist...
In this tutorial, Jennifer shows how you can use a location's latitude to determine how far north or south it is from another location. The same process can be used to calculate how far east or west a location is from another using longitude. One important reminder that is shown is how many minutes of latitude are in one degree of longitude.
Explains why GC dist is shortest possible distance on the surface of earth. Example to calculate GC dist, initial course and final course.
A Fix can also be obtained by combining a compass bearing and a distance of the same lighthouse. You can determine the distance knowing the height and the vertical sextant angle of the lighthouse. Let's assume you sail near the coast and, looking on your nautical chart, you spot the lighthouse A. Among the characteristics of the lighthouse, you read that it has a charted height of 103 meters or 338 feet. This is the height above mean high water spring tide. After calculating the height of tide at that time, the corrected height of the lighthouse is 105 meters or 345 feet. Use the sextant and measure the vertical angle of the lighthouse. Let's assume, after applying the index error, that the vertical angle is 2 degrees and 30 minutes. Knowing the corrected height and the corrected v...
Part 2 of my CRP5 series, showing the way to use a CRP-5 to convert distances. The most useful conversions to know are: 1m = 3.28ft 1nm = 1,852m 1nm = 1.852km 1nm = 6,080ft 1nm = 1.15sm 1sm = 1,610m 1sm = 1.610km
Use this equation to figure out how far away the horizon is! The square root of your height above sea level (in feet) x 1.17 = distance to horizon in nautical miles. (1 nautical mile = 1,852 metres)
Some basics of navigation, I go through the following topics on how to read a nautical chart: - Depths - Buoys, RRR - Hazards - Latitude and Longitude - Distances - Compass Rose - Magnetic vs True North Kayak Hipster http://www.kayakhipster.com
Use of cosine formula to calculate GC distance
Nautical Miles Find the distance along an arc on the surface of the earth that subtends a central angle of 1 minute . This distance is called a nautical mile. (The radius of the earth is 3960 mi.)
This video will teach you how to find the distance of the earth. It explain what is the different between longitude and latitude of distance in the earth. At the same time, it introduce two very useful formula for distance. Anyways, If you would like to have more interaction with me, or ask me more question, or suggest some chapter u want to learn, please add the facebook page at "y=mx+c" or www.facebook.com/maths.video.
make circle by centre point Latitude and Longitude and distance in degress and nautical miles
For comparison, and eventual integration into an edited video (lol). FYI the ration of nautical miles to statute miles os 1: 1.15 (approx.) so 10 nautical miles is 11.5 (statute) miles; 13 nautical miles is 15 miles; and 15 nautical miles is over 17 miles.
How to measure distance on a nautical chart.
Part 5 really starting to take shape. Here's a short list of Airport to airport codes and distances. Remember, the distances are based on a ball shape earth, but even though the earth is flat, those distances are still relative and therefore useful. SYD to USH 5877 miles (9458 kilometers, 5107 nautical miles). http://www.airmilescalculator.com/distance/syd-to-ush/ DEL New Delhi to MAA 1096 miles (1764 kilometers, 953 nautical miles). DEL to CGK Jacarta 3105 miles (4997 kilometers, 2698 nautical miles). CGK to SYD. 3433 miles (5525 kilometers, 2983 nautical miles). MAA to CGK 2249 miles (3620 kilometers, 1955 nautical miles). MNL Manila to CGK 1734 miles (2791 kilometers, 1507 nautical miles). MNL to SYD. 3896 miles (6269 kilometers, 3385 nautical miles). DEL to MNL HKG H...
This video is part of the online captain’s license course offered by US Captains Training. It is used in conjunction with classroom training and offered to the world for free via YouTube. The video goes over Distance, Speed, and Time Overview in the chart navigation section of US Captain’s Training’s Online Master Captain’s license course.
You can obtain a fix by combining two or more distances or distances and compass bearings. This is how you plot a fix position combining two or more distances: Let's assume you sail near the coast. The radar is in good working condition and in operation. Taking into account your last position, and after comparing the nautical chart's coast line with that on the radar screen, you spot two points on the screen, A and B, from where you can take distances. The equivalent ones on the nautical chart are points A and B. Using the radar's range marker you measure a distance of 5.2 nautical miles from point A, and 2.8 nautical miles from point B. You note the time - let's assume it is 0930 hours. Then return to the nautical chart, and using the dividers, span a distance of 5.2 nautical mil...
Nautical Miles Find the distance along an arc on the surface of the earth that subtends a central angle of 1 minute . This distance is called a nautical mile. (The radius of the earth is 3960 mi.)
Answer to Navigation question 10 - Use dividers to on the Timor Sea chart below to find the distance in nautical miles between : a) the peak on Moa and the northern lighthouse on Wetar b) the lighthouses on Kisar and Lakor c) Recon light and the peak on Babar
Answer to Navigation question 10 - Use dividers to on the Timor Sea chart below to find the distance in nautical miles between : a) the peak on Moa and the northern lighthouse on Wetar b) the lighthouses on Kisar and Lakor c) Recon light and the peak on Babar
How to measure distance on a chart and work out the time it will take to travel. Nautical navigation. Watersports training
Part 2 of my CRP5 series, showing the way to use a CRP-5 to convert distances. The most useful conversions to know are: 1m = 3.28ft 1nm = 1,852m 1nm = 1.852km 1nm = 6,080ft 1nm = 1.15sm 1sm = 1,610m 1sm = 1.610km
For comparison, and eventual integration into an edited video (lol). FYI the ration of nautical miles to statute miles os 1: 1.15 (approx.) so 10 nautical miles is 11.5 (statute) miles; 13 nautical miles is 15 miles; and 15 nautical miles is over 17 miles.
A sailor's description of the various weather and oceanographic systems encountered at sea, and how these can be interpreted and dealt with by the small boat sailor without the volumes of internet based information and predictions available to land based arm-chair sailors.
more at http://search.quickfound.net/map_search_and_news.html Basic Map Reading Part II Grid, Distance and Elevation "USE OF MILITARY GRID SYSTEM TO LOCATE POSITIONS; USE OF GRAPHIC SCALES TO MEASURE DISTANCE; USE OF CONTOUR LINES TO IDENTIFY TOPOGRAPHIC DETAIL." US Army Training Film TF5-3719 see also: Direction, Orientation and Location with a Compass https://www.youtube.com/watch?v=nfDFqdqJe2o Public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and mild video noise reduction applied. The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and equalization (the resulting sound, though not perfect, is far less noisy than the original). http://en.wikipedia.org/wiki/Topograph...
Check my Amazon shop at https://www.amazon.com/shop/nevermindyourown After my first failed attempt to fly 8 kms and land the Phantom 4 on the terras of my rented holiday home - because I lost signal after 1.5 kms - I did a couple of tests to be sure what the behaviour of the Phantom is, so I would be prepared in this next attempt. Now I try again and it's going pretty well actually... Better than last time. Location: Guimar, Tenerife, Spain Introduction: 0:00 Launching: 2:12 Point of no return: 10:15 Signal losses: 11:32 Landing (but where?): 18:38 epilogue: 20:59 aftermath: 23:07 The previous videos can be found here: part 1 - launching and landing at 8kms: https://www.youtube.com/playlist?list=PLA9690E62ED6D323D part 2 first failed attempt: https://www.youtube.com/watch?v=Tkl6p0mr4m...
The learning objectives for this Video are: Why has voyage planning? Company responsibilities to provide adequate procedures and instructions? Factors to consider when deciding the appropriate route. Principles of voyage planning and its execution with and without ECDIS Keypoints What is voyage planning? Company policy and procedures Voyage plan consideration When should voyage planning be done? Route validation Responsibility for voyage planning Principle of passage planning Plan appraisal Planning controls Voyage planning using electronic chart display system Voyage planning on ECDIS Use of RNC charts Transferring route plans to other navigation aids Voyage planning in ocean waters Monitoring Pre-arrival planning Navigation with pilot Use of ships routing IMO ship routing systems Ship ...
Подписывайся на канал FILM.UA Group - https://www.youtube.com/user/FilmUaGroup Сайт - http://goo.gl/oORnr IMDB - http://goo.gl/0PQvB Instagram - http://goo.gl/JiyAC Twitter - http://goo.gl/ur5Elo LinkedIn - http://goo.gl/myBN0 Vimeo - http://goo.gl/c57k6 Жанр: докудрама Тип: документальный Год: 2011 Режиссер: Миша Костров Креативный директор: Евгений Санников Продюсер: Виктор Мирский, Сергей Созановский Креативный продюсер: Оксана Майданская Оператор: Владимир Кратинов Автор сценария: Наталья Доильницына Награды: Platinum Remi Award, WorldFest Houston 2013 Докудрама "Свободная энергия Теслы" объединила в себе историческую реконструкцию событий жизни великого ученого-физика и красивую CGI-графику, которая иллюстрирует смелые научные опыты и эксперименты с электричеством. Еще в детстве, б...
The Mercator projection is a cylindrical map projection presented by the Flemish geographer and cartographer Gerardus Mercator in 1569. It became the standard map projection for nautical purposes because of its ability to represent lines of constant course, known as rhumb lines or loxodromes, as straight segments which conserve the angles with the meridians. While the linear scale is equal in all directions around any point, thus preserving the angles and the shapes of small objects (which makes the projection conformal), the Mercator projection distorts the size and shape of large objects, as the scale increases from the Equator to the poles, where it becomes infinite. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image sourc...
Inland and coastal waters are particularly hazardous to groundings and sinkings due to wind, waves, rocky shoals, submerged obstructions, strong currents, tidal swings of water depth, restricted visibility from fog, rain and darkness, other vessel traffic, shore lights and more. The US Coast Guard and local agencies deploy a comprehensive array of navigational aids including buoys, beacons, lights, dayboards, racons, bells, whistles, gongs, horns and more to assist mariners in safe conduct through these areas in all kinds of weather and traffic conditions. This seminar describes the navigational aids and their meanings, sources for authoritative description of specific Nav Aids in specific locations, and how mariners can acquire the latest change information in their area of interest for...
Explains the celestial navigation triangle, its component parts and how it is solved. Using the Triangle for celestial navigation and great circle route sailings This video is for experienced celestial navigators who want to know more about the celestial navigation triangle.
This seminar will describe Celestial Navigation at sea, and how it can be combined with other information to form a useful ocean navigation process. If you ever wanted to know what celestial navigation was all about, this is your primer...
FREE ENERGY – 1000 Mile Hydro Generator SAILING Trial - On Luckyfish we are well on the path to supplying all our energy needs, on anchor or under sail, using renewable energy. With the installation of a hydrogenerator, we can now meet all our energy demands when passage making. At just 5 knots of boat speed the hydro gen produces the same amount of power as a good quality wind generator in 18 knots of apparent wind. Something we rarely see as we spend much of our time reaching or running. We estimate the unit produces about 0.2 knots of drag, or costs us about 5 nautical miles a day if we keep it immersed full time. In this video we look at our unique installation solution and the performance of the unit over a 1,000 mile sea-trial. We hope you enjoy, comment and question. And, do like, ...
----------------------------------------------------------------------------------------------------- Starting out with Python, Third Edition, Tony Gaddis Chapter 5 Programming Challenges -------------------------------------------------------------------------------------------------------------------------------------------------------------------- 1. Kilometer Converter Write a program that asks the user to enter a distance in kilometers, and then converts that distance to miles. The conversion formula is as follows: Miles = Kilometers x 0.6214 Starting out with Python. Third Edition. Tony Gaddis. -------------------------------------------------------------------------------------------------------------------------------------------------------------------- Bitcoin Address - 1AbnaH...
Flat Earth • 2017 • Chippy The Chipmunk wonders: Does SIZE matter? Is it as BIG as you think it is? Or, have we been lied to? Perhaps it's considerably SMALLER than you think? Be sure to watch this video in its entirety to see what Gleason has to say. Chippy takes a closer look at Fig. 25 in the Gleason Book & how the Gleason Map can be two different sizes. Is it 78,000 miles in circumference (to match what the globe says), or is it about 50,000 miles to match what Gleason believed (or none of the above)? Chippy has been going over the Gleason material for several months, mainly due to the complexity of the map, the patented Gleason "time-chart" and the 402 page Gleason Book. I believe Gleason did his homework & had read Rowbotham, Carpenter, and others. It seems Gleason was a very educ...
Welcome to DocuStream. A brand of New Era Media channel group, proposing Documentary videos and breaking news from around the world. Subscribe to our channel & keep updated with latest news, TV shows and documentaries in HD Quality. https://www.youtube.com/channel/UCPySWgCVjzBSYGjzMnZVM_w What evidence exists for a flat earth? What proof is out there? We debunk the myths around a flat earth one by one. Awesome footage taken on December 17, 2017 by Wide Awake (Please subscribe - he's one of the best) - https://www.youtube.com/channel/UCkxN... Earth Curvature Calculator: https://dizzib.github.io/earth/curve-... Coordinates conversion: http://boulter.com/gps/ Brochure with Coordinates (page 4): http://www.hernandocounty.us/parks_re... Distance to the Horizon Calculator: http://www.ringbe...
Golden Fleece Great Circle Yacht Race Blue Water Challenge 1980. The "Golden Fleece Trophy", was commissioned by the Golden Fleece Oil Company for the "Great Circle Yacht Race" around Tasmania, a distance of 810 nautical miles. It was won by SISKA, owned and sailed by Rolly Tasker. In 1988 Rolly Tasker rededicated it as the "SISKA TROPHY" and it is awarded annually to the most outstanding yacht in the Western Australian Offshore Yacht Racing Series.
Flat Earth • 2017 • Chippy The Chipmunk looks at the Gleason PDF book, which claims longitude lines are straight & have a divergence ratio of 3⅓ miles per every 5° of latitude. Chippy has made additions to the Gleason Map to illustrate this divergence. Please let me know if this is correct. It is based on page 402 (figure 43) of Alexander Gleason's (MUST READ) Free PDF Book: "Is the Bible from Heaven? Is the Earth a Globe?" According to Gleason, our Sun & Polaris are BOTH at a fixed distance of 1,985 statute miles (1,725 Nautical miles) above our Flat Earth circular plane. Chippy's New Gleason Map for download: https://1drv.ms/i/s!AuPUSW-_Ob0ynUWAy2YzoGETW75X Alex Gleason's Free PDF Book download: https://1drv.ms/b/s!AuPUSW-_Ob0ynRbfkRKxYHMAfytM Please SUBSCRIBE & share, or you can go...