A distance table shows the driving distance over streets from one or more origins to one or more destinations. A distance table is useful for finding out how far customers are willing to drive to a store and nearest store alternatives.
Admiralty distance tables giving shortest distances between ports. There are supporting diagrams and text as well as link tables for places not in the same or adjacent table.
The distances are given in miles. Each number represents the distance between two towns. The first town is the one directly above the number and the second is the town to the right of the number.
The Admiralty Distance Tables are a three part series of tables, sub-divided by region, giving the shortest distances between ports.
Split across 75 volumes, coverage includes the world's main commercial shipping routes and ports. Each volume of Sailing Directions offers: Information on navigational hazards, buoyage, pilotage, regulations, general notes on countries, port facilities, seasonal currents, ice and climatic conditions.
Distance is measured on the latitude scale, at the sides of the chart. One minute of latitude is one nautical mile-at that latitude. One nautical mile is 1852 metres. One minute is one nautical mile (M) at that latitude because on Mercator Projection charts the latitude scale increases the further north you travel.
To find the Distance use the formula of D=ST/60. You would multiply the Speed of 14 by the Time of 40 and divide by 60, giving you a distance of 9.33 nautical miles.
Distances are always measured from the Latitude scale and not from Longitude. This is because distances between latitude lines are equal whereas longitude lines get smaller the closer you get to the earth's poles.
Nautical charts are key to safe navigation.
It is a map that depicts the configuration of the shoreline and seafloor. It provides water depths, locations of dangers to navigation, locations and characteristics of aids to navigation, anchorages, and other features.
The ADMIRALTY Digital Catalogue (ADC) provides a comprehensive and up-to-date reference of ADMIRALTY Maritime Data Solutions, including Standard Nautical Charts and Nautical Publications, as well as AVCS, ARCS, ADMIRALTY ECDIS Service and T&P NMs.
(i) Distance-Time Graph: It shows the change in position with time. (ii) The slope of the distance-time graph gives speed. (iii) Velocity-Time Graph: It shows how the velocity of a body changes with time. (iv) The slope of the velocity-time graph gives acceleration.
The formula of distance is Distance = Speed x Time.
distance = speed × time. time = distance ÷ speed.
Q. Which Unit of distance is used in navigation? Notes: A nautical mile is a unit of measurement used in both air and marine navigation, and for the definition of territorial waters. Historically, it was defined as one minute of latitude along any line of longitude.
Essential sailing terms for beginners
' You can sail in any direction except directly into the wind, in the no go zone, about 40 degrees off the wind is about as close as you can get. So, if you want to sail upwind you need to zigzag from side to side of the no go zone.
absolute beginners: under 10 knots - anything under 10 knots prevents capsizing. for more serious training: 15 - 20 knots. for heavy offshore boats: 20 - 25 knots - anything under 12 and the boat doesn't even come to life. 25 knots and up is considered rough for any small/mid-sized boat.
The most comfortable sailing is in winds from 5 to 12 knots. Below 5 knots the wind is too light and maneuvering and powering the boat with the sails may become difficult.
Measuring Tapes
There are two types of measuring tapes. Tape measures are portable tools that can clip to a belt and measure maximum distances ranging from 6 feet to 33 feet, depending on tape length. A long tape measures distances between 100 and 300 feet and unspools from a reel.