200 ton Oceans Navigation Video SeriesThis video series solves every problem on the 200ton oceans navigation sample exam, which is available on the National Maritime Center website, or you can download it here.
The videos are not for beginners  this series is designed for those studying for their exam and a basic understanding of celestial navigation. Some of the concepts are described in my other celestial navigation video series such as Getting Started in Celestial Navigation. Good luck! 


Introduction
This video introduces the exam and the tools available to you. 

Question 1
The distance in miles between the circle of equal altitude for the observed altitude (Ho) and the circle of equal altitude for the computed altitude (Hc) is ___________. 

Question 2 (Part 1)
Your 0745 ZT 15 July position is 2904.0'N, 7117.5W. You are on course 165T at 8 knots. You observe three morning sun lines. Determine the latitude and longitude of your 1130 running fix. 

Question 2 (Part 2)
A continuation of the previous problem in which we plot the solution. 

Question 3
On 10 April, your 1630 ZT position is 2103N, 6311W. You are on course 324T at 22 knots. What will be the zone time of sunset at your vessel? 

Question 4
You are on course 238T. To check the course of your vessel you should observe a celestial body on which bearing? 

Question 5
On 12 July your 0800 ZT position is 2415N, 13230W. Your vessel is on course 045T at 15 knots. What is the ZT of local apparent noon? 

Question 6
The great circle distance from 3508S and 1926E to 3316S and 11536E is 4559 miles and the initial course is 121T. Determine the longitude of the vertex. 

Question 7
While steaming at 17 knots, your vessel consumes 382 barrels of fuel per day. In order to reduce consumption to 223 barrels per day, what is the maximum speed the vessel can turn for? 

Question 8
A vessel at 3224.7N, 6628.9W heads for a destination of 3658.7N, 7542.2W. Determine the true course by Mercator sailing. 

Question 9
On 17 December your 0600ZT fix is 2716.7N, 13839.2W. Your course is 137T and your speed is 14.8 knots. LAN occurs at 1207ZT at which time you observe the lower limb of the sun. The Ho is 4022.1'. What is the calculated latitude at LAN? 

Question 10
On 16 July at 2000 zone time, you take a sextant observation of Polaris. Your vessel's DR position is 2722N, 14835W and your sextant reads 2657.5. Your chronometer reads 05:59:16 and your chronometer error is 01m 28s slow. Your height of eye is 48 feet and the index error is 1.3' off the arc. What is the latitude of your vessel by Polaris? 