BM1 SWE STUDY MATERIAL UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
Question:
Deviation
Answer:
Amount of deflection influenced by a vessel and its electronics on the compass.
Can be caused by metal objects around the compass, electric motors, the boat
itself.
Question:
Is the boats heading affected by the geographical
location?
Answer:
No
Question:
How often must a deviation table be completed and
approved by the Unit Commander?
Answer:
Annually, after yard availabilities, after addition/deletion of equipment or
structural alterations that would affect the magnetic characteristics of the boat.
Question:
When obtaining the deviation, whats the best
position/location to use?
Answer:
One that will not interfere with normal shipping traffic.
Question:
Steps in determining the magnetic bearing of the range
Answer:
1. Align the edge of the parallel ruler so that it passes through the charted
positions of the two objects.
2. Line up the edge of the parallel ruler with the center of the nearest compass
rose.
3. Read the magnetic bearing off the inner circle of the compass rose.
Question:
Man made ranges that are marked on the chart will be in
true degrees or magnetic?
Answer:
True
Question:
Determining error
, Answer:
If the magnetic compass course is more than the magnetic bearing of the range
than the error is West, if its less than its East.
"Compass least error east, compass best error west"
Question:
Can the deviation table used by ships be altered for use
by boats?
Answer:
Yes
Question:
Ideally, objects used to determine deviation should be
_____ degrees apart
Answer:
15 degrees
*its not necessary as long as there are a minimum of 10 objects/bearings evenly
separated through out the 360 degrees*
Question:
What scale chart should be used when determining
variation?
Answer:
Largest scale possible
Question:
How long can you wait to report a disabling casualty to
the operational Commander, followed by releasing a
boat status message?
Answer:
12 hours from when the casualty is discovered
Question:
Those which restrict the operations of the boat such that it can perform some
missions, but not all missions safely.
Answer:
Restrictive discrepancies
Question:
Can verbal waivers be granted for restrictive
discrepancies?
Answer:
Yes, as long as a written waiver is given within 4 hours.
Question:
The written waiver shall contain what information?
Answer:
QUESTIONS AND CORRECT ANSWERS
Question:
Deviation
Answer:
Amount of deflection influenced by a vessel and its electronics on the compass.
Can be caused by metal objects around the compass, electric motors, the boat
itself.
Question:
Is the boats heading affected by the geographical
location?
Answer:
No
Question:
How often must a deviation table be completed and
approved by the Unit Commander?
Answer:
Annually, after yard availabilities, after addition/deletion of equipment or
structural alterations that would affect the magnetic characteristics of the boat.
Question:
When obtaining the deviation, whats the best
position/location to use?
Answer:
One that will not interfere with normal shipping traffic.
Question:
Steps in determining the magnetic bearing of the range
Answer:
1. Align the edge of the parallel ruler so that it passes through the charted
positions of the two objects.
2. Line up the edge of the parallel ruler with the center of the nearest compass
rose.
3. Read the magnetic bearing off the inner circle of the compass rose.
Question:
Man made ranges that are marked on the chart will be in
true degrees or magnetic?
Answer:
True
Question:
Determining error
, Answer:
If the magnetic compass course is more than the magnetic bearing of the range
than the error is West, if its less than its East.
"Compass least error east, compass best error west"
Question:
Can the deviation table used by ships be altered for use
by boats?
Answer:
Yes
Question:
Ideally, objects used to determine deviation should be
_____ degrees apart
Answer:
15 degrees
*its not necessary as long as there are a minimum of 10 objects/bearings evenly
separated through out the 360 degrees*
Question:
What scale chart should be used when determining
variation?
Answer:
Largest scale possible
Question:
How long can you wait to report a disabling casualty to
the operational Commander, followed by releasing a
boat status message?
Answer:
12 hours from when the casualty is discovered
Question:
Those which restrict the operations of the boat such that it can perform some
missions, but not all missions safely.
Answer:
Restrictive discrepancies
Question:
Can verbal waivers be granted for restrictive
discrepancies?
Answer:
Yes, as long as a written waiver is given within 4 hours.
Question:
The written waiver shall contain what information?
Answer:
