ASA 106 Special Piloting Techniques

Question 1

Circle of position

Answer 1

every object on the line is equidistant from an object

Question 2

COP

Answer 2

Circle of Position

Question 3

Double the relative bow bearings (say 30 and 60 degrees)

Answer 3

At exactly double, forms an isosceles triangle, so the distance run between the bearings is the distance off

Question 4

When taking the first bearing of a running fix it is important to immediately

Answer 4

… start a stop watch or note the distance log

Question 5

When taking a running fix, it is important not to change the boat’s

Answer 5

course

Question 6

When taking a running fix, the first bearing will ideally be between ___ and ___ degrees

Answer 6

30 and 45

Question 7

Instead of doubling the angle with a bow relative reading, half the angle when taking a

Answer 7

stern reading for distance off. The distance run between bearings is the distance off when object was abeam.

Question 8

Range of visibility is equal to (equation)

Answer 8

1.144 x sq. root height in feet = X nautical miles

Question 9

Bobbing the horizon can give distance off by adding together two ranges of ______. Describe method

Answer 9

visibility – the objects and the eye. Sit or stand, lower and raise head by about 1 foot. If blinks, then boat on that COP.

Question 10

To convert nautical miles into statute miles, multiply by

Answer 10

1.15 (6076/5280)

Question 11

To convert statute miles into nautical miles, _____ by 1.15

Answer 11

divide

Question 12

Three important uses for COPs

Answer 12

1. Plot an estimated position
2. Combine with an bearing LOP and you have a fix
3. Keep you a safe distance from shore

Question 13

Using a COP, the EP is where it passes closest to the…

Answer 13

DR position for that time

Question 14

Using a COP, the EP is where it passes closest to the…

Answer 14

DR position for that time

Question 15

How get distance off using sound?

Answer 15

Sound travels at 5 seconds per nautical mile. Watch for loud event, count, calculate.

Question 16

Eye blink method for distance off

Answer 16

Hold out a pen, close one eye, align pen with object, switch eyes, estimate on-land distance of how far the pen moved, multiply by 10

Question 17

Counting trees

Answer 17

3 miles off can see the water meeting the shore; 2 miles off can count windows on a house; 1 mile off can make out individual trees

Question 18

Hand width calculation of distance off (method)

Answer 18

Need two objects of known distance apart (from chart) Hold hand/palm a distance infront of eyes to just cover both objects. Formula Distance Off = (distance face to hand (inches)x(ground distance (miles) / width of hand

Question 19

Two marks to put on chart with danger bearings

Answer 19

NLT NMT

Question 20

Bear in mind that danger bearings are bearings ___ ____ ____, not about a ___ ___ _____.

Answer 20

to an object, course to steer

Question 21

When there is current or strong winds, it is improper to tell the steerer to steer directly to a _____ _____, since could be moving sideways into danger while steerer doing _____ _____.

Answer 21

single object; nothing wrong

Question 22

You can also draw a ____ ____ all the way around a danger point

Answer 22

Danger Circle

Question 23

What is The Rule of 60 to avoid a hazard?

Answer 23

Calculating a course alteration when a hazard is a known distance ahead. Formula = 60 * desired distance off object / distance hazard ahead

Question 24

Ideally the most difficult part of a passage should be done a what point of sail? Why?

Answer 24

A reach. More speed and maneuverability, less going on when beating.

Question 25

One safe way of plotting routes is to deliberately sail toward…

Answer 25

lighted objects

Question 26

One safe way of plotting courses is to plan a series of ____ legs of pre-computed time duration. Set ___ at set intervals.

Answer 26

short; watch/timer

Question 27

Keep well clear of a _____ shore

Answer 27

lee

Question 28

If at night (or even during day) and confused about location with potential dangers nearby, ____-___ and figure it out.

Answer 28

heave-to