Map Reading and Interpretation

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Presentation transcript:

Map Reading and Interpretation Direction and Bearing

Each map conveys a message Each map conveys a message. In map reading, it is necessary to understand the devices used to convey this message. Devices: Locational grid - latitude and longitude Scale – measure distance Symbols – identify natural and constructed features

Identifying Location How could you describe the location of a place a friend needs to get to? Location can be described / identified using: Direction Bearings

Direction Direction on maps may be indicated using: Compass Rose Shows the points of a compass as shown on a map Includes cardinal and intercardinal directions The Cardinal Directions The Intercardinal Directions A Compass Rose

Compass Rose

Did your map have compass directions? Compass rose or a variation If your map does not have a compass rose or any other direction indicator then it is assumed to have standard orientation. Standard orientation means that north is at the top of the map page. Terminology: Do not use the term “up” to refer to the north. North is not higher than south. Do you think rivers flow north into the Arctic Ocean

Direction: Describing / Words Cardinal direction Uses north, south, east, west Intercardinal direction Uses northwest, northeast, southwest, southeast Properly naming directions between cardinal and intercardinal points always uses the cardinal direction first: Point between south and southeast South-southeast

Bearing Bearings: Used when greater precision is required Substitute the degrees of a circle for the named directions Clockwise angle between a reference direction (magnetic North normally) and direction of object Bearings

Think Direction/ Think Bearing

Describe the location of Point B from Point C: Using the crosshair, the location is NNW. A closer look – is it really NNW? Determine the direction more accurately. Use bearings. This takes you to a ballpark For accuracy, use a protractor. Place the base of the protractor on the north-south line The center line is lined up with the east-west line 337o

What is the direction of B from A? Generally E What is the bearing of A from B? 275o Actual Measure: _273_ What is the direction of A from C? Generally WNW What is the bearing of C from A? Actual Measure: 115o

Activity: Direction and Bearing Using the map provided to practice determining direction and bearing.