Latitude, Longitude, and Spherical Coordinate System Grids. When you put two coordinates together as a pair (X, Y), you can locate anything on Earth. Latitude and longitude form our coordinate system grid. Also, you can express coordinates in different ways. For example, you can use decimal degrees or degrees-minutes-seconds. The first part of an MGRS coordinate is the grid-zone designation. The 6° wide UTM zones, numbered 1-60, are intersected by latitude bands that are normally 8° high, lettered C-X (omitting I and O). the number for zones 1 to 9 is just a single digit, according to the example in DMA TM 8358.1, Section 3-2, Figure 7), followed by the identify a 1000 square meter grid square. Six digits identify a 100-meter grid square. Eight digits identify a 10-meter grid square. To locate a point by grid reference is a simple matter. We follow a simple rule of map reading: READ RIGHT AND UP 507 5. COMPASS TERMS AND CONCEPTS Mar 17, 2020. 39280. The Grid Square Locator, also known as the Maidenhead Locator System, is a geographical co-ordinate method based on a 6-digit code, widely used by amateur radio operators to determine a rough position on the Earth. The grid locator system is one of the many peculiarities that characterize the amateur radio world, and of The first screen shot shows a web mapping application reporting the location of a mouse click to thirteen places (one ten-trillionth of a degree). That precision implies an accuracy of plus or minus 0.0000001 meters. Yet we know that the accuracy of the background aerial photo is probably no better than plus or minus 10 meters. The coordinates for any point on the map can now be expressed as an 8 digit number such as 09360215. The general expression in reference to reading these coordinates is RIGHT-UP. The first four numbers (read left to right) will locate the east-west position on a horizontal grid line. The last four numbers (read bottom to top) locate the north - Identify and define true, magnetic, and grid north. Identify the purpose of the different colors on a military map. Identify various features of terrain. Identify and define index, intermediate, and supplementary contour lines. Locate a four-, six-, and eight-digit grid coordinate using a protractor. Improve your map reading skills by learning how to read a 4-figure, 6-figure or 8-figure national grid reference. This grid reference finder is suitable for beginners and includes a short 'how to' video. Example The GJ local grid. For example, on a GEOREF chart, Naval Air Station Patuxent River (38°17′10″N 76°24′42″W) / (38.286108, -76.4291704) is located (to the nearest minute) at position GJPJ3417. To locate the position from the coordinates, proceed as follows: Right from 180° longitude to longitude zone G scale on the bottom grid line until Point A is under the vertical (right-hand) scale. To determine the six-digit coordinate, the 100 meter mark on the bottom scale, which is nearest ther vertical grid line, is the third digit of the number 255. The 100-meter mark on the vertical scale, which is nearest Point A, is the sixth digit of the number 797. jJnn.