S-130 Map and Compass 4

Question 1

On a topographic map, V-shaped contour lines pointing downhill (away from the summit) indicate what terrain feature?

Accepted Answer

A spur or ridge

Answer

V-shaped contours with the point of the V directed downhill (away from high ground) represent a spur or ridge extending outward from higher terrain.

Question 2

In the UTM coordinate system, what are the two components that define a location within a grid zone?

Accepted Answer

Easting and Northing

Answer

UTM coordinates use Easting (distance east of the zone's central meridian) and Northing (distance north of the equator) to pinpoint a location.

Question 3

Why should a wildland firefighter avoid placing a compass near a metal radio or vehicle when taking a bearing?

Accepted Answer

Metal objects can deflect the compass needle, causing an inaccurate reading

Answer

Ferrous metal and electronic devices create local magnetic fields that deflect the compass needle and produce false readings.

Question 4

A map legend shows a symbol that looks like a small tree cluster in green. What does this most likely represent on a USGS map?

Accepted Answer

A forested or wooded area

Answer

Green vegetation symbols on USGS topographic maps indicate areas with significant tree or shrub cover.

Question 5

What is 'triangulation' as applied to compass navigation in the field?

Accepted Answer

Using bearings to two or more known landmarks to determine your unknown position

Answer

Triangulation involves taking compass bearings to two or more identifiable landmarks and plotting the back bearings on a map to find where they intersect — your location.

(S-130) Wildland Firefighting Training Certification Practice Test

(S-130) Wildland Firefighting Training Certification Practice Test

S-130 Map and Compass 4