Homework Answers 

Akron Power Squadron - Advanced Piloting Class

Chapter 3  -  1 
Refer to plotting standards, p 124

1.  Start at 1300.   L 41° 45.0’,  Lo 71° 55.0’.  This is a fix - should be labeled 1300 GPS, denoting a GPS fix (diagram is incorrect).

Course 230 T.  Plot course line.  Convert to magnetic.  V = 15W.  Label Course and Speed.

2.  At 1330, you take compass bearing 318° on "Fl R 6 s horn."

Determine true bearing, plot as true, label as magnetic.  Time goes above the bearing line, bearing goes below.

Calculate and plot DR position using 60 D = ST

3.  At 1355, you take compass bearing 280° on "Chapman Pt - Fl 6 s."

Determine true bearing, plot as true, label as magnetic.  

Calculate and plot 1355 DR position using 60 D = ST.

Advance 1330 bearing the distance between 1330 DR and 1355 DR (2.5 nm).  Draw the advanced bearing at 303 T (318 M).  This line will cross your course line 2.5 nm past the original intersection of course line and 1330 bearing.

Advanced bearing is labeled with "initial bearing time - second bearing time" above the bearing line, and the magnetic bearing below the line.

Fix is intersection of 1355 bearing and advanced bearing, and labelled 1355 R FIX.

4.  RFIX is   L 41° 41.6’ N,  Lo 72° 01.7’ W.  


Chapter 3  -  2 
Determine your position, based on Bowdich Bay chart.

1.  This is like using clues to solve a mystery.  Start with what you know.

-  Heading is 071° M, convert to true (056°)

-  Cursor is at 324°R, convert to true
TB = TH + RB(True Bearing = True Heading +                                              Relative Bearing)
TB = 056 + 324 = 380.  Subtract 360 to get
TB = 020°

-  Land mass to your port is about 2.2 nm at closest point.  

- RB to extreme point of land mass is about 309°.
You coiuld use your circular or other protractor (if you have one), or use the course plotter - set bulls-eye at center of radar screen, and align the parellel line that goes through the bulls-eye with the edge of the island.
The "heads up" line crosses the scale on the course plotter at 309°

- Land mass to starboard is about RB 142° and about 2.3 nm.

- You could draw this pattern on tracing paper and slide it along the charts until you see a "fit", like shown below.

- If you're very observant, you might detect the bridge in the lower left hand corner of the radar display.

Here's the screen layed over the Bowdich Bay chart