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Chapter 2 Homework Questions
1. Computer-assisted navigation systems are:
a. of use to the mariner only when used on-board a boat that is underway.
b. useful for planning a cruise in the comfort of one's home or office.
c. too expensive today for any application other than on commercial vessels.
d. designed to only support vector charts.
2. The most accurate radar fix is obtained by:
a. a line of bearing to a point of land.
b. the range to a point of land.
c. both range and bearing to a known point.
d. using simultaneous ranges to two or more known points.
3. An electronic bearing line (EBL) lays a line of bearing over a target to:
a. determine the range to the target.
b. determine the bearing to the target.
c. eliminate sea clutter in the area of the target.
d. best define the target size and shape.
4. The variable range marker (VRM) on the radar display screen is used to determine:
a. target resolution.
b. bearing to a target.
c. distance to a target.
d. range resolution.
5. Range rings on a radar display screen allow the operator to estimate the:
a. distance to a displayed object.
b. bearing to a displayed object.
c. size of a displayed object.
d. amount of sea clutter.
6. According to the rules of relative motion
a. all fixed objects such as navigation aids and land masses remain stationary on the radar display screen.
b. all fixed objects appear to be moving in a direction opposite from your boat's motion.
c. all non-fixed (moving) objects appear to be -moving at right angles to the center of the radar screen display.
d. all non-fixed (moving) objects appear to be moving toward the center of the radar display screen
7. According to the rules of relative motion, on a boat's radar screen when your boat increases speed going forward,
all relative motion tends to move toward the bottom of the display screen.
8. Fixed objects can be differentiated from moving objects on the radar screen by noting which objects appear to be
a. away from the center of the radar display screen in relation to your boat's course and speed.
b. at an angle to the center of the radar display screen in relation to your boat's course and speed.
c. upward on the radar display screen in relation to your boat's course and speed.
d. downward on the radar screen in relation to your boat's course and speed.
9. A "lollypop" displayed on a radar screen is a dashed line to a circle: --
a. indicating the boat's heading.
b. indicating a GPS waypoint.
c. indicating a potential risk of collision.
d. indicating a route
10. A depth sounder, when combined with another navigation tool, can be used to estimate a boat's position.
11. The primary purpose of a depth sounder is to:
a. determine the condition of the sea bed below the hull of a boat.
b. provide primary navigation data.
c. determine water depth below the hull of a boat.
d. detect and analyze the nature of objects found below the hull of a boat.
12. Depth sounders can be used to crosscheck the proper functioning of the GPS.