Flotilla 12-10 Navigation Study Guide Chapter 6: Piloting Instructor: Forrest Meiere PowerPoint...

Navigation Study GuideF

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Chapter 6: PilotingInstructor: Forrest Meiere

PowerPoint Presentation

by Forrest Meiere

All Questions and Problems

from the Study Guide


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S6-2. Why are LOPs drawn on buoys (floating atons) to be treated with caution?

S6-l. What distinguishes PILOTING from other branches of navigation? The reference to charted landmarks, ATONs and depth soundings.

Buoys can be sunk or off station. (Buoys can be moved and the new position may not be on the chart being used.)


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S6-4. How can a relative bearing be used to plot an LOP?

S6-3. What is the proper way to label an LOP?On its top with the time of observation (24 hour system) and on the bottom with the bearing from the vessel to the object.

Add the relative bearing to the true heading to obtain an LOP.


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S6-5. How can a range be used to obtain an LOP if no bearing was obtained for the range?

Extend the range until it crosses the course line. As with any LOP, record the time the alignment occurred on the top of the LOP

S6-6. A circle of position is based on a measurement of distance to the charted object. What methods of measuring distance are generally available to the navigator? a. RADARb. Measurement of vertical angle with a sextantc. Range Finder


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S6- 7. When using the height of an object printed on the l2l0-Tr chart, what are the units used and what is the reference (datum) for the measurement?

feet; Mean High Water

S6-8. List six type of FIXES discussed in the text.

a. Cross Bearing; b. Range and Bearing;c. Two Ranges; d. Two Distances;e. Distance and Bearing of Object; f. Passing close to a fixed Aid to Navigation.


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S6-9. What factors can affect the accuracy of an LOP?

a. Inaccurate measurement of relative bearingsb. Mathematical Errorsc. Inaccurate Compass Readingsd. Inaccurate Plotting

S6-10. How are visual FIXES labeled?

A point with a full circle around it and the time (in 24 hour format) parallel to the horizontal base of the chart


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S6-11. List the steps necessary to plot a running fix.

a. Allow for a time lapse between the 1st and 2nd bearing

b. One LOP is advanced by moving it parallel to itself in the direction of the course line for the distance traveled. The intersection of these two LOPs is the Running Fix.

c. A new dead reckoning plot is started at the position of the R FIX

d. Avoid advancing an LOP more than 30 minutes

End of Questions


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P6-1. With the object dead ahead (RB 000°), plot and label the following LOPs:

1813/330

P6-1 OBJECT TIME BEARINGa. MONUMENT, CUTTYHUNK I. 6:13 p.m. 330

b. CUPOLA, NAUSHON I.(NE) 9:30 a.m. 012C0930/000

PROBLEMS: Use the 1210- Tr chart and the deviation table in Lesson 2.


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P6-1 OBJECT TIME BEARINGc. SPIRE, CHILMARK, 1 :00 p.m. 314C MARTHA'S VINEYARD 1300/298

d. SPIRE, GAY HEAD 10:53 p.m. 168C MARTHA'S VINEYARD 2253/150

e. WATER TOWER 10:16 a.m. 157C WOODS HOLE 1016/140

f. TOWER 7:30 a.m. 288C GOOSEBERRY NECK 0730/270


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P6-1 OBJECT TIME BEARINGg. TOWER 8:01 a.m. 358C GOOSEBERRY NECK 0801/345

h. BUTLER FLATS LIGHT 6:25 a.m. 334C NEW BEDFORD 0625/320

i. NEW BEDFORD 6:25 a.m. 324C R TR (WNBH) 0625/309


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P6-1 OBJECT TIME BEARINGj. TOWER, WEST ISLAND 3:28 a.m. 288C

0328/270

k. SOUTH TIP, PENIKESE I. 2:31 p.m. 039C1431/030

l. RADAR TOWER midnight 12:00 005C MARTHA'S VINEYARD 0000/352


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P6-2 TIME OBJECT (A) OBJECT (B)a. 2:15 a.m. GAY HEAD, SPIRE GAY HEAD

LIGHTAlt Gp Fl (3)&(1) R

40 s

P6-2. Plot and label the following ranges:

0215

b. 2: 15 p.m. MARTHA'S VINEYARDCHILMARK SPIRE RADAR TOWER1415

c. 3:12 p.m. MARTHA'S VINEYARDLOOKOUT TOWER AERO Rot W & G1512


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P6-2 TIME OBJECT (A) OBJECT (B)d. 12:23 a.m. WOODS HOLE

DOME WATER TOWER0023

e. 7:35 a.m. ROUND HILL POINTWINDMILL TANK0735

f. 8:35 p.m. NASHAWENA ISLANDMONUMENT HOUSE2035

g. 11 :23 a.m. CUTTYHUNK ISLANDMONUMENT LOOKOUT TOWER1123


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P6-2 TIME OBJECT (A) OBJECT (B)h. 6:28 p.m. CUTTYHUNK I. NASHAWENA I.

LOOKOUT TOWER MONUMENT1828

i. 9:13 a.m. MARTHA'S VINEYARDMENEMSHAPOND RADAR TOWERENTRANCE LIGHT

0913

j. 10:17 p.m. FALMOUTHTOWER STACK2217


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OBJECT TIME DISTANCE(M)a. GAY HEAD 10:15 p.m. 3.1 Alt Gp PI (3) W & (1) R 40 Sec 170 ft 17 M

P6-3. Plot and label the following Circles of Position:

2215D 3.1

b. CUTTYHUNK ISLAND 7:15a.m. 2.0 LOOKOUT TOWER

0715D 2.0

c. MARTHA'S VINEYARD 6:25 a.m. 4.2LOOKOUT TOWER

0625D 4.2

D3.7


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0825D 6.5

e. MARTHA'S VINEYARD 2:28 p.m. 5.0 AERO Rot W & G

1428D 5.0

f. NOMANS LAND 11 :38 p.m. 5.2

NORTH TIP

2338D 5.2

OBJECT TIME DISTANCE(M)d. GAY HEAD SPIRE 8:25 a.m. 6.5

g. PENIKESE I. 12:03 a.m. 3.2 SOUTH TIP

0003D 3.2


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OBJECT TIME DISTANCE(M)h. WOODS HOLE 3:15 p.m. 2.6 WATER TOWER

1515D 2.6

i. BUTLER FLATS LIGHT 6:18 p.m. 1.81818D 1.8

j. GOOSEBERRY NECK 5:27 p.m. 1.9

TOWER

1727D 1.9

k. BUZZARD'S LIGHT 1:00 p.m. 3.7 PI 2.5sec 101ft 22M HORN

1300D3.7

D3.7


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P6-4. At 10:30 p.m., while on a course of C231 at 10.0 kn, from Buoy "27" FIG 4 sec BELL, in Vineyard Sound, you note a light flashing every six seconds on the starboard beam (090R) when your heading is 251C.

a. Draw the course line and label it: C231S10.0

b. Plot the bearing and label it: 2230 321


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P6-5. While heading 251C, at 7:00 p.m. south of PASQUE Island, you note a flashing green light every four seconds off your port bow (315R). Plot the bearing and label it. 1900

186


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P6-6. The MONUMENT on NASHAWENA ISLAND can be seen off the starboard bow (045R) while on heading 25lC at 9:30 a.m.

Plot the bearing and label it. 0930276


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6-7 . On another day at 6:25 a.m., while running C262C at S 10.0, you sight the CUTTYHUNK ISLAND MONUMENT on the starboard beam over the vessel's compass at 090R. At the same time you note that the MONUMENT and the HOUSE on NASHA WENA ISLAND are in range.

a. What is the compass bearing of the CUTTYHUNK MONUMENT?352C

b. Plot and label the FIX, and determine its latitude and longitude: DOT WITHIN CIRCLE, 0625

L: 41° 22.8'N Lo: 70° 55.4W


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6-8. Southeast of GAY HEAD on MARTHA'S VINEYARD at 1527, you are barely making way, and you take a bow bearing of 322C on GAY HEAD SPIRE. You then turn the boat toward the AERO Rot W & G beacon at the airport on MARTHA'S VINEYARD and obtain a bearing of 029C.

a. Plot and label these two LOPs and the resulting FIX:1527 1527307 019

b. What is the position of the FIX?

L: 41° 15.7'N Lo: 70° 40.4'W

DOT WITHIN CIRCLE, 1527


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6-9. At 0625 you are between NASHAWENA ISLAND and GAY HEAD and note that the MONU- MENT and HOUSE on NASHAWENA ISLAND are in range. You also note that the SPIRE and the light on GAY HEAD (Alt Gp PI (3) W & (1) R 40 sec, 170 ft 17 M) are in range. Plot these two LOPs and plot and label the FIX they form.

FIX label: DOT WITHIN CIRCLE, 0625

What is the position of the FIX?L: 41° 22.8'N Lo: 70° 55.4'W


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DOT WITHIN CIRCLE, 0715 RADAR

L: 41° 20.3'N Lo: 70° 57.5'Wb. Position:

6-10. At 0715, while on course ofC288C at ordered speed of 10.0 to, you detect a strong PIP on the RADAR at the NW tip of GAY HEAD, range 5.6M. You also notice a good PIP about the center of CUTTYHUNK ISLAND which you decide is the TOWER and measure the range at 5.1M.Plot and label these two LOPs and the FIX they determine.

083

012

a. FIX label:

c. Bearing to PIP on GAY HEAD:

d. Bearing to PIP on CUTTYHUNK:


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DOT WITHIN CIRCLE, 2215 RADAR

L: 41°13.2'N Lo: 70° 043.2'Wb. Position:

P6-11. While underway at 2215 on course C239C, you take a RADAR distance (5.1M) and bearing (082R) on the North tip of NOMANS LAND. Plot and label the LOPs, determine and label the FIX, and provide its position.

2215, 5.1

2215, 302

a. FIX label:

c. Range LOP:

d. Bearing LOP:


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P6-12. While underway on C23l/Sl0.0 from Buoy "27" PI G 4 sec BELL, approximately three miles southwest of WOODS HOLE entrance in VINEYARD SOUND, you take a bearing on the light at the head of TARPAULIN COVE, NAUSHON ISLAND, PI 6 sec 78 ft 9 M, at bearing 090R at 5: 15 p.m. At 5:33 p.m. you take a bearing on the light at GAY HEAD, Nt Gp PI (3) W & (1) R 40 sec, bearing 341R while on course.

C231S10.0

b. Plot and label the 5:15 p.m. LOP:

a. Plot and label the course line:

1715 321


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L: 41° 24.7'N Lo: 70° 47.0'W

P6-12. (Continued)

C231S10.0

d. Advance the 5: 15 LOP to 5:33. Plot and label.

c. Plot and label the 5:33 p.m. LOP:

1715-1733 321

e. Plot and label the RUNNING FIX: 1733 R FIX

f. Position:


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P6-13. Assume all the same facts as in problem 6-12 with the additional information that, over this time period, at 5:30 p.m. a 2.5 kn current is flowing in VINEYARD SOUND toward 231 true.

C231S10.0

b. Plot and label the 5: 15 p.m. LOP:


1715 321


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L: 41° 24.0'N Lo: 70° 47.6'W

P6-13. (Continued)

1733 212

d. Advance the 5: 15 LOP to 5:33. Plot and label.

c. Plot and label the 5:33 p.m. LOP:

1715-1733 321

e. Plot and label the RUNNING FIX: 1733 R FIX

f. Position:


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P6-14. While underway on C251C/S 10.0 in VINEYARD SOUND, you observe the light on GAY HEAD (Alt Gp PI (3) W & (1) R 40 sec) bearing 3l5R at 10:30 a.m. Nine minutes later the light is abeam (270R). Plot and label the RUNNING FIX and determine its position.

1039 R FIXL: 41° 22.1'N Lo: 70°

51.4'W


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P6-15. Continuing from the position determined in 6-14 above, establish a danger bearing using BUZ- ZARDS LIGHT (PI 2.5 sec 101 ft 22M HORN) to clear the Sow and Pigs Reef by .5 M. What are the true, magnetic, and compass (ship's head) danger bearings on the BUZZARDS LIGHT?

NLT 282T NLT 297M NLT 299C


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P6-16. Departing at 6:11 p.m. from L: 41° l8.8'N Lo: 70° 5l.7'W, you are underway on C136C/S12.0. At 6:40 p.m. the CHILMARK SPIRE on MARTHA'S VINEYARD is observed to bear 236R while your heading is l36C.

C120S12.0

b. Plot and label the 6:40 p.m. DR:


DOT WITHIN SEMICIRCLE and 1840 at angle


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P6-16. (Continued)1840 356

d. Plot and label an Estimated Position (EP) for the 6:40 p.m. LOP observation and determine its position:

c. Plot and label the SPIRE LOP:

DOT WITHIN SQUARE EPL: 41° 15.9'N Lo: 70° 44.2'W

P6-17. Prove that an EP constructed from a DR position and a single LOP is generally closer to the true position than the DR position. See discussion in Study Guide

End of Problems

Flotilla 12-10 Navigation Study Guide Chapter 6: Piloting Instructor: Forrest Meiere PowerPoint...

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