The course given is S 83° 22' E, find the true course?
Given:
S 83° 23' E- quadrantal course
what is asked?
find the true course
Solution:
1. " AS IS" if the angle is in the first quadrant
2. In the second quadrant: 180° minus the angle given
3. In the 3rd quadrant: 180° + the angle
4. In the 4th quadrant: 360° - the angle
So since the given course is in the second quadrant, we have to subtract the 180°.
180° is equal to 179° 60'
- 83° 22'
96° 38' is the answer
A ship covers a distance of 12 miles in 2 hrs. Find her speed?
Given:
Distance = 12 miles
Time = 2 hours
What is asked?
Find the ship's speed
Solution:
We have to divide distance by time to get the speed. So this is the formula for speed:
Speed = Distance ÷ Time
= 12 miles ÷ 2 hours
= 6 miles per hour or 6 knots
So the ship's speed is 6 knots.
If you find this blog helpful, please click share button. Sharing is caring.
See Related Posts
For 18 hours, a vessel steamed at an average speed of 10 kts. What was the total distance?
Given:
Time = 18 hours
Speed = 10 knots
What is asked?
Total distance run for 18 hrs
Solution:
1. We have to multiply ship's speed and the steaming time to get the distance. This is the formula:
Distance = speed × time
= 10 nm/hr × 18 hrs
2. Eliminate the hours
Distance = 10 nm/ hr × 18 hrs
= 10 nm × 18
= 180 nm is the distance run
 |
| Formula for getting distance |
 |
| nullM/V LITE FERRY 20 |
The steaming time acquired by the vessel is 149. 6 hours, how many days of navigation did she travel?
Given:
Steaming time = 149.6 hours
What is asked:
Convert ship's steaming time into days
Solution:
1.We have to divide 149.6 by 24 to get the number of days.
149.6 ÷ 24 = 6.23333 days
2. Then subtract 6 - 6
0.23333 days
3. Then multiply by 24 to get hours.
0.23333 days × 24 = 5.59992 hours
4. Subtract 5 - 5
0.59992 hours
5. Multiply it by 60 to get minutes × 60
36 minutes
So the final answer is 6 days 5 hours 36 minutes
If you find this blog helpful, please click share button. Sharing is caring.
See Related Posts
A vessel sailed on a total distance of 120 miles for 10 knots. How many hours did she do for the trip?
Given:
Distance = 120 miles
Solve for the ship's steaming time
Solution:
The formula for solving ship's steaming time is to divide distance by the speed.
Time = Distance ÷ Speed
= 120 miles ÷ 10 miles/hour
Now we can can eliminate miles
= 120 miles ÷ 10 miles/hour
= 120 ÷ 10 hours
= 12 hours is the ship's steaming time
If you find this blog helpful, please click share button. Sharing is caring.
See Related Posts
From longitude 155° E thru 155° W, what is the difference of longitude (DLO)?
Given:
155° E - longitude 1
155° W - longitude 2
What is asked?
Calculate the difference of longitude (DLO)
Solution:
longitude 1 =⁷ 155° E
longitude 2 = 155° W ( + because different sign)
DLO = 310°
- 360°
50° E is difference of longitude
Find the LHA of a star if the GHA of the star is 81° 57.3' and the longitude is 174° 32.9' W.
Given:
81° 57.3' - GHA of a star
174° 32.9' W - longitude
What is asked?
Find the LHA of a star
Solution:
1. To get LHA we have to subtract GHA and longitude.
LHA = GHA - longitude
we have to add 360° to the GHA since the longitude is greater.
GHA = 441° 57.3'
longitude = 174° 32.9' W (-)
LHA Star = 267° 24.4' is the answer
By the way, Local Hour Angle is the angular distance measured westerly from the Local Celestial Meridian to the body up to 360°.
If you find this blog helpful, please click share button. Sharing is caring.
You Might Also Like
The LMT of longitude 78° 18' west is 04H 03M. Find the GMT.
Given:
78° 18' W - longitude
04H 03M - LMT
Solution:
1. We have to convert arc to time, that is we are going to divide the longitude by 15 to get time.
78° 18' ÷ 15° = 05h 13.2 mins
2. Now we are going to add LMT to our answer in step 1 to get the GMT.
As for the rule in getting GMT:
From LMT to GMT, longitude W (+) E (-)
Longitude in time = 05h 13.2 mins
LMT = 04h 03 m +
GMT = 09h 16.2 mins
If you find this blog helpful, please click the share below to share this post to your friends. Sharing is caring...
From latitude 14 degrees north thru latitude 14 degrees south, what is the DLAT?
Given:
Latitude 1 = 14 degrees north
Latitude 2 = 14 degrees south
Solution:
This is the rule for solving DLAT ,
Same name of latitude--we have to subtract
Different name of latitude -- we have to add
Latitude = 14 degrees north
Latitude = 14 degrees south
Dlat = 28 degrees south is the difference of latitude
The sign of the DLAT is south because that is the direction.
P.S. Like what you read? Please click the share button below to share this post to your friends. Sharing is caring...
Let us solve to know how much is the equatorial radius of the earth.
Solution:
1. First we have to calculate how much is the earth's circumference at the equator. Since every minute of an arc at the equator is equavalent to 1 nautical mile, therefore the circumference of the earth at the equator is 21,600 nautical miles.
2. We can derive from the formula of circumference to get the radius.
Circumference = 2 π radius
Radius = circumference
2 π
= 21,600
2 x 3.1416
= 3437.739 nautical miles
3. We have to multiply 3437.739 natical miles by 1.1515 to convert to statute miles.
3437.739 nautical miles
X 1.1515
3958.6 statute miles is the equatorial radius of the earth.
P.S. Like what you read? Please click the share button below to share this post to your friends. Sharing is caring...
Determine the area of a triangle with a base of 3.5 feet and a height of 4 feer.
Given:
Base = 3.5 feet
Height = 4 feet
What is asked?
Area of a triangle
Solution:
1. The formula to getting the area of a triangle is
Area of triangle = 1/2 bh
= 3.5 ft x 4 ft / 2
= 14 ft² / 2
= 7 ft²
P.S. Like what you read? Please click the share button below to share this post to your friends. Sharing is caring...
A vessel whose TPC is 12.3 is drawing 4 meters. A rectangular midship compartment 12 meters long, 10 meters bread, and 6 meters depth has a permeability of 20%. What would be the mean draught if this compartment was bilged?
Given:
TPC = 12.3
Draft = 4 meters
Lenght of the compartment = 12 meters
Breadth of the compartment = 10 meters
Depth of the compartment = 6 meters
Permeability = 20%
What is asked:
mean draught if this compartment was bilge?
Solution:
1. We have to calculate the displacement. But first we have to convert 4 meters to centimeters.
4 m x 100 cm/1m = 400 cm
Now this is the formula to getting displacement:
Displacement = TPC X draft in centimeters
= 12.3 x 400 cm
= 4,920 tons
2. Then we have to solve for the additional weight added due to flooding.
Weight = lenght x bread x draft x density
= 12 x 10 x 4 x 1.025
= 492 Tons
But with 20% of permeability, so 492 tons x 20% = 98.4 tons
3. So now we are going to add the original displacement and the additional weight to get the total displacement.
Original displacement = 4 ,920 tons
Additional weight = 98.4 tons
Total displacement = 5, 018.4 tons
4. Now the final step which is solving for the ship's draft.
Draft = displacement / TPC
= 5,018.4 tons / 12.3
= 408 cms
= 4.08 meters is the final answer
P.S. Like what you read? Please click the share button below to share this post to your friends. Sharing is caring...
At 0800H, two ships was observed to be 33 miles apart on opposite courses. One ship was running at 12 knots while the other was making 10 knots. At what time of the day will they be abeam from each other?
Given:
Time : 0800H
Distance: 33 miles
Ship's sppeed of one ship: 12 knots
Ship's speed of the other ship: 10 knots
What is askes in the problem?
At what time of the day the two ships on opposite courses will be abeam from each other.
Solution:
1. Add the speed of the two ships.
12 lnots + 10 knots = 22 knots
2. Solve for the steaming time that these two ships on opposite courses will meet to each other. This is the formula in getting time.
Time = distance / speed
Time = 33 miles / 22 knots
Time = 1.5 hours (1 hr 30 minutes)
3. Now we are going to add the answer in step 2 to the time when the two ships are 33 miles from each other which is 0800H.
0800
+
0130
0930H - the final answer
So the the time of day when the two ships will be abeam from each other is 0930H.
P.S. Like what you read? Please click the share button below to share this post to your friends. Sharing is caring...
