BM1 SWE Exam Study with all Correct & 100% Verified
Answers |Latest Version |Already Graded A+
Deviation ✔Correct 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.
Deviation easy definition ✔Correct Answer-The difference between the magnetic and
compass bearing.
Is the boats heading affected by the geographical location? ✔Correct Answer-No
How often must a deviation table be completed and approved by the Unit Commander?
✔Correct Answer-Annually, after yard availabilities, after addition/deletion of equipment or
structural alterations that would affect the magnetic characteristics of the boat.
Where is the original copy of the deviation table kept? ✔Correct Answer-Boat record, copy
shall be posted on the boat near the compass.
How man degrees is the deviation table tabulated for? ✔Correct Answer-Every 15 degrees
Commonly used practice to determine deviation? ✔Correct Answer-Running range
What is a range? (In relation to a running range) ✔Correct Answer-A line of bearing made by
two fixed objects.
When obtaining the deviation, whats the best position/location to use? ✔Correct Answer-
One that will not interfere with normal shipping traffic.
Steps in determining the magnetic bearing of the range ✔Correct 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.
Man made ranges that are marked on the chart will be in true degrees or magnetic?
✔Correct Answer-True
To correct the compass.. ✔Correct Answer-Subtract easterly errors, add westerly errors
Determining error ✔Correct 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"
Answers |Latest Version |Already Graded A+
Deviation ✔Correct 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.
Deviation easy definition ✔Correct Answer-The difference between the magnetic and
compass bearing.
Is the boats heading affected by the geographical location? ✔Correct Answer-No
How often must a deviation table be completed and approved by the Unit Commander?
✔Correct Answer-Annually, after yard availabilities, after addition/deletion of equipment or
structural alterations that would affect the magnetic characteristics of the boat.
Where is the original copy of the deviation table kept? ✔Correct Answer-Boat record, copy
shall be posted on the boat near the compass.
How man degrees is the deviation table tabulated for? ✔Correct Answer-Every 15 degrees
Commonly used practice to determine deviation? ✔Correct Answer-Running range
What is a range? (In relation to a running range) ✔Correct Answer-A line of bearing made by
two fixed objects.
When obtaining the deviation, whats the best position/location to use? ✔Correct Answer-
One that will not interfere with normal shipping traffic.
Steps in determining the magnetic bearing of the range ✔Correct 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.
Man made ranges that are marked on the chart will be in true degrees or magnetic?
✔Correct Answer-True
To correct the compass.. ✔Correct Answer-Subtract easterly errors, add westerly errors
Determining error ✔Correct 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"
