SUBSIM Radio Room Forums - View Single Post - plot a course with Latitude and Longitude

don1reed · 04-30-06, 03:08 PM

Here I've made a plotting sheet using the formula Longitude minutes x cos Latitude.

my base is 1 tenth of inch = 1 nm Latitude on right vertical (meridian). You could use mm or cm...whatever, I use tenths of inch 'cause it's easier for my old eyes to see.
All distance on natical charts is measured in minutes of LATITUDE

36' x cos 58° = 19.07 tenths of inch west of 001° Longitude.

This is how you would plot your position. Now, plot other ship's position. If the other ship is farther than 2 nautical miles away, you then need a larger plotting sheet or a chart. The Navigation-L site has those plotting sheets.

04-30-06, 03:08 PM	#7
don1reed Ace of the Deep Join Date: Dec 2004 Location: Valhalla: Silent Generation Posts: 1,149 Downloads: 910 Uploads: 0	Here I've made a plotting sheet using the formula Longitude minutes x cos Latitude. my base is 1 tenth of inch = 1 nm Latitude on right vertical (meridian). You could use mm or cm...whatever, I use tenths of inch 'cause it's easier for my old eyes to see. All distance on natical charts is measured in minutes of LATITUDE 36' x cos 58° = 19.07 tenths of inch west of 001° Longitude. This is how you would plot your position. Now, plot other ship's position. If the other ship is farther than 2 nautical miles away, you then need a larger plotting sheet or a chart. The Navigation-L site has those plotting sheets. __________________ [SIGPIC][/SIGPIC] During times of universal deceit, telling the truth becomes a revolutionary act. ~ George Orwell