USCG Deck Misc (Supplementary)
Module Code: USCG MISC • 133 verified questions across 5 practice sets with 46 CFR and engineering rule citations. Completely free with zero paywalls.
USCG Deck Misc (Supplementary) Practice Sets
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USCG MISC Practice Set 1
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USCG MISC Practice Set 2
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USCG MISC Practice Set 3
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USCG MISC Practice Set 4
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USCG MISC Practice Set 5
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Sample USCG Deck Misc (Supplementary) Questions & Solutions
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On 6 April your 0300 DR position is LAT 27°42' S, LONG 128°58' W. You are on course 097°T at a speed of 18 knots. You observed 3 celestial bodies. Determine the latitude and longitude of your 0600 running fix.
Advancing a celestial line of position using dead reckoning accounts for course and speed over the three-hour time interval between sights. Applying the run vector (097°T at 18 knots for 3 hours = 54 miles) to the intercept lines yields LAT 27°44.7'S, LONG 127°47.5'W.
On 15 February at 0610 ZT, in DR position LAT 56°53.0' N, LONG 157°02.9' E, you observe Polaris at a sextant altitude (hs) of 56°10.4'. The index error is 2.5' on the arc, and the height of eye is 18 meters. What is the latitude?
Correcting sextant altitude for index error (on the arc, subtract) and dip derived from an 18-meter height of eye provides apparent altitude. Applying refraction and the Nautical Almanac Polaris tables (tabular corrections a0, a1, a2) based on local hour angle of Aries yields LAT 56°41.8'N.
On 20 February your 0530 ZT DR position is LAT 24°15.0'N, LONG 137°33.0'W. You are on course 033°T at a speed of 18 knots. You observed 3 celestial bodies. Determine the latitude and longitude of your 0600 running fix.
Applying a 30-minute run at 18 knots along course 033°T establishes the vessel's movement vector. Shifting the earlier celestial intercepts along this run line and intersecting them determines the definitive running fix at 0600 ZT, resulting in LAT 24°27.5'N, LONG 137°31.8'W.
On 22 November your vessel is enroute from Accra, Ghana to Montevideo, Uruguay. You are on course 240°T and making a speed of 15.0 knots. Your 1129 DR position is LAT 28°25.0' S, LONG 42°40.0' W. You observed 3 celestial bodies. Determine the latitude and longitude of your 1137 running fix.
Calculating the vessel's run over the 8-minute time interval (15 knots multiplied by 0.133 hours equals 2.0 miles along 240°T) and applying this vector to the observed celestial intercepts produces the precise position LAT 28°27.0'S, LONG 42°38.0'W.
The speed necessary to reach port at a designated time is 18.7 knots. The propeller pitch is 24'03", and you estimate 3% positive slip. How many RPM's will the shaft have to turn?
Propeller slip calculations require converting speed in knots to feet per minute, factoring propeller pitch in feet, and adjusting for 3% positive slip using the standard marine engineering formula: RPM = (Speed x 6080) / [Pitch x (1 - Slip) x 60].
On 13 August your 0345 ZT DR position is LAT 21°35.0' N, LONG 135°26.0'W. You are on course 052°T at a speed of 14 knots. What will be the zone time of sunrise at your vessel?
Extracting local mean time of sunrise from the Nautical Almanac for the given date and latitude, then applying the longitude correction (converted to time) and the zone description, determines the exact zone time of sunrise as 0536.
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