Basic NavigationBasic NavigationLecture 2Lecture 2

ACP32 Vol2ACP32 Vol2

Basic NavigationBasic Navigation

By the end of this lecture you should By the end of this lecture you should know:know:

The anatomy of a typical compassThe anatomy of a typical compass How to set a map with a compassHow to set a map with a compass Taking a bearingTaking a bearing ResectionResection

Anatomy of CompassAnatomy of Compass

Anatomy of CompassAnatomy of Compass

Magnetic VariationMagnetic Variation

The needle of the compass aligns with the The needle of the compass aligns with the earth’s magnetic field.earth’s magnetic field.

If your compass is near large amounts of If your compass is near large amounts of metal or electrical equipment you will not metal or electrical equipment you will not get a true magnetic reading.get a true magnetic reading.

Setting a Map with a CompassSetting a Map with a Compass

Ideal in reduced visibility or low-feature environments.Ideal in reduced visibility or low-feature environments.

1, Turn the capsule until the GMA is set against the 1, Turn the capsule until the GMA is set against the direction arrow.direction arrow.

2, Place the compass on the map with the 2, Place the compass on the map with the edge along a North-South grid line.edge along a North-South grid line.

3, Turn BOTH the map and the compass until the needle 3, Turn BOTH the map and the compass until the needle aligns in the orienting arrow in the capsulealigns in the orienting arrow in the capsule

The map is now set!The map is now set!

Taking a BearingTaking a Bearing

Not a Bear Ring, a Bearing or heading!Not a Bear Ring, a Bearing or heading!

Taking a BearingTaking a Bearing

Use this to stay on track Use this to stay on track and provide a hand held and provide a hand held travel aid without the travel aid without the need to keep the map set need to keep the map set and in your face.and in your face.

1, Place the edge of the 1, Place the edge of the compass on the map compass on the map between your position between your position and your objective.and your objective.

Taking a BearingTaking a Bearing

2, Turn the capsule so the orienting lines align with the 2, Turn the capsule so the orienting lines align with the North-South grid lines.North-South grid lines.

3, Turn the capsule again to 3, Turn the capsule again to addadd the GMA. (GRID to MAG, the GMA. (GRID to MAG, ADD)ADD)

Taking a BearingTaking a Bearing

4, Hold the compass in front of you and turn until the 4, Hold the compass in front of you and turn until the needle falls in the orienting arrow.needle falls in the orienting arrow.

The direction of travel arrow now point at the objective.The direction of travel arrow now point at the objective.

Taking a BearingTaking a Bearing

You can also use bearings to check what a You can also use bearings to check what a feature is.feature is.

1, Point the direction of travel arrow at the 1, Point the direction of travel arrow at the feature.feature.

2, Turn the capsule until the needle aligns with 2, Turn the capsule until the needle aligns with the orienting arrow.the orienting arrow.

3, Turn the capsule again to 3, Turn the capsule again to deductdeduct the GMA the GMA (MAG to GRID, GET RID).(MAG to GRID, GET RID).

Taking a BearingTaking a Bearing

4, Place the compass on the map, edge on your 4, Place the compass on the map, edge on your position.position.

5, Pivot the compass around your position until 5, Pivot the compass around your position until the orienting lines run North-South.the orienting lines run North-South.

The edge of the compass will now align your The edge of the compass will now align your position with the feature on your mapposition with the feature on your map

ResectionResection

Used to “get your bearings” and check exactly Used to “get your bearings” and check exactly where you are.where you are.

Repeat the previous steps for identifying a Repeat the previous steps for identifying a feature with a bearing at leastfeature with a bearing at least 3 times on three different 3 times on three different features.features.

Where these lines intersect Where these lines intersect is your exact position. is your exact position.