Transcript Status Report: development of new courses for Piloting

United States Power Squadrons®
Advanced Piloting Course
(Coastal Navigation)
Chapter 8
Effects of Winds/Current
Educational Officer – Dave West
[email protected] - 651-429-3840
Assistant Educational Officer – David Moberg
[email protected] – 715-386-8582
Instructor – Art Mollica
[email protected] - 651-777-0277
PART 4
APPENDIX A - WEEKEND CRUISE
2
QHG1
1300
MPG1
24) You arrive at “1” BELL at the entrance to
Menemsha Basin at 1300 and secure your boat
to a dock. You call your friend and he tells you
to check the tide charts to determine when you
will be able to raft up to him. His dock is in 3’ of
water at MLW. You need 2’ of clearance & your
boat draws 3.0 feet.
3
24a) Using the tide charts for Gay Head
determine if you could raft up with your
friend at 1400. Will you have enough
water for clearance? NO clearance 12
inches under keel
24b) Which government agency is
located at Menemsha Basin? Coast
Guard
04 54
4
Currents – Horizontal Movement
Flood Current – from sea towards
shore or up tidal river or estuary
Slack – time at which horizontal
movement stops
Ebb Current – away from shore or
down a tidal river or estuary
Slide 5
Why Worry About Currents
Slide 6
Perfect World – No Currents
Slide 7
With Current – Crabbing
Slide 8
With Wind – Leeway
Slide 9
No current/leeway
Current/leeway
Course steered
Course steered
Watch Your Wake
Steering steady course
Slide 10
Three Variables
With Current
1.5kn current
Against Current
Cross Current
Slide 11
Current Vectors
Current Direction – Set
Current Speed – Drift
Not Always Opposite Directions
From sea toward land
Away from land
water Speeds
DifferentSlack
Maximum
Slide 12
Rule of Twelfths (50-90)
Maximum Flood Speed
100%
90%
50%
50%
1/3
1/3
1/3
1/3
1/3
1/3
1/3
1/3
1/3
1/3
Slack
1/3
Ebb
1/3
Slack
100%
Flood
90%
Slack
Maximum Ebb Speed
Slack Water
Time Intervals
Slide 13
Rule of Twelfths (50-90)
Slack Water
5hr45min
=
345min
/ 3 = 115min
Max Flood
4hr21min = 261min / 3 = 87min
Slack Water
2hr39min
=
159min
/ 3 = 53min
Max Ebb
2hr57min
=
177min
/ 3 = 59min
Slack Water
0421 0.0kn
0616 0.8kn 50%
0811 1.4kn 90%
1006 1.5kn
1133 1.4kn 90%
1300 0.8kn 50%
1427 0.0kn
1520 1.3kn 50%
1613 2.3kn 90%
1706 2.6kn
1805 2.3kn 90%
1904 1.3kn 50%
2003 0.0kn
Slide 14
Table 1
Slide 15
Table 2
Slide 16
10 MINUTE BREAK
10
9
8
7TAKE
6 YOUR
5
4 SEATS
3
2
PLEASE
1
Estimating Current
One Part at a Time
• Slack to Max Flood/Ebb
• Max Flood/Ebb to Slack
• Slack to Max Flood/Ebb
• Max Flood/Ebb to Slack
Determine Time Interval
Use Percentages
• Slack to Max
• Max to Slack
Slide 18
Example 1
Location: Marblehead
Channel (Sub-Station 996)
Reference Station: Boston
Harbor (Deer Island)
Calculate speed & direction
on 18 May 2004 1400 EDT
Figure 8-4 & 8-5
Marblehead Channel
Boston Harbor (Deer Island)
18 May 2004
1300
1026
01 09
Figures
8-7 ++&01
8-90.3
1429 E 1.2
09
1135
1538 E
998
0.4
105
JJ – Exercise 8-1
Chris G – Exercise 8-2
1538
1135
0403
243
81
Karen – Exercise 8-3
Figures 8-11 & 12
81
1135 8-4
1256
Terry – Exercise
81
81
1417
1538
Dean – Exercise 8-5
Chris S – Exercise 8-6
E
0.4
50
0.2
105
Slide 19
Exercise 8-1
Location: 0.2nm west of
West Chop, Ma
(Sub-Station 1941)
Calculate speed & direction
on 1 Sep 2004 1000 EST
West Chop 0.2nm West
Pollack Rip Channel
1 Sep 2004
0751 F
1056
2.2
+ 01 34
+ 01 50
1.3
1941
1000
0925 F
1246
2.9
059
1246
0925
0321
201
67
67
F
67
0925
1032
2.9
90
67
1139
2.6
1246
059
Slide 20
Exercise 8-2
Location: Waquoit Bay
Entrance
(Sub-Station 1926)
Waquoit Bay Entrance
Pollack Rip Channel
26 Aug 2004
Calculate speed & direction
on 26 Aug 2004 1100 EST
0536
0811 E
+ 03 40
+ 04 01
1.4
0.8
1926
1100
0916
1212 E
1.1
203
1212
0916
0256
176
59
59
E
59
0916
1015
1.1
90
59
1114
1.0
1213
203
Slide 21
Exercise 8-3
Location: Southeast of
Nobska Point
(Sub-Station 1946)
Nobska Point
Pollack Rip Channel
24 Sep 2004
Calculate speed & direction
on 24 Sep 2004 0100 EST
2225
0210 F
+ 02 33
+ 02 15
1.8
1946
0100
0058
0425 F
1.3
2.3
071
0425
0058
0327
207
69
69
0058
F
0.0
69
0207
0
69
0316
0.0
0425
----
Slide 22
Exercise 8-4
Location: 0.8 miles east of
Yellow Bluff
(Sub-Station 551)
0.8 miles east of Yellow Bluff
Golden Gate Bridge
1 Sep 2004
1000
Calculate speed & direction
on 1 Sep 2004 1000 PST
0819
1122 F
+ 00 19
+ 00 15
3.6
1.0
0838
1137 F
1946
3.6
022
1137
0838
0259
179
60
60
F
60
0838
0938
3.6
50
60
1038
1.8
1138
022
Slide 23
Exercise 8-5
Location: Richardson Bay
Entrance
(Sub-Station 601)
Calculate speed & direction
on 26 Aug 2004 1100 PST
Richardson Bay Entrance
Golden Gate Bridge
26 Aug 2004
1243 E
1507
1.0
- 02 34
-03.06
0.3
1946
1100
1009 E
1201
0.3
225
1201
1009
0152
112
37
37
F
37
1009
1046
0.3
90
37
1123
0.3
1200
225
Slide 24
Exercise 8-6
Location: 0.75 miles east of
Angel Island
(Sub-Station 586)
0.75 miles east of Angel Island
Golden Gate Bridge
24 Sep 2004
0100
Calculate speed & direction
on 24 Sep 2004 0100 PST
2000
2342 E
+ 01 33
+ 01 50
2.2
0.5
2133
0132 E
1946
1.1
192
0132
2133
0359
239
80
80
F
80
2133
2253
1.1
100
80
2413
1.1
0133
192 Slide 25
United States Power Squadrons®
Advanced Piloting Course
(Coastal Navigation)
Chapter 9
Piloting with Wind/Currents
Educational Officer – Dave West
[email protected] - 651-429-3840
Assistant Educational Officer – David Moberg
[email protected] – 715-386-8582
Instructor – Art Mollica
[email protected] - 651-777-0277
Terminology
Course
 Direction boat is steered (C)
Direction Traveled Between Two Fixes
 Course Made Good (CMG) - Track Made Good (TMG)
Actual Direction of Travel Over Ground
 Course Over the Ground (COG)
Current
 Direction of flow (Set) – speed of current (Drift)
Track
 Intended Direction of Movement (Trk)
Speed
 Rate of motion through water (S)
Speed of Advance
 Intended Speed along the Track (SOA)
Course to Steer
Use same baseline for each vector
Distance between 1130DR and 1130 GPS = 4nm
Direction from 1130DR to 1130 GPS = 042º
Time = 2hrs
60D = ST
S
= 60 X 4.0 / 120
Dft = 2.0nm
1130 GPS
Set 042
Dft 2.0
1030 GPS
Determine course to steer to maintain COG 305M
Apply expected Set/Drift from 1130 GPS
Draw arc equal to boat speed = 10.0kn
Draw course from Set/Drift to intersection
Distance from 1130 GPS to intersection = SOG
From 1130 GPS draw course line at 295M
0930 GPS
Course to Steer
Use same baseline for each vector
Set 059
Dft 2.6
N “3”
Exercise 8-1 Computed Set 059º Drift 2.6
What is course to steer to reach destination from N”3”
at 15kn?
Dest
Exercise 9-1
Plot waypoints R”4” Fl R 6s BELL as BBR4 and G“7”
Fl G 4s as BBG7
Depart BBR4 at 1000 for BBG7, speed 10kn
BBR4
1000
Visual
At 1031, BBG7 bears 239ºM at 4.5nm
Set 017M
Dft 2.3
Determine set and drift and plot new course to BBG7
Qualify new course
T = 247
V = 15 W
M = 262
T = 212
V = 15 W
M = 227
T = 236
V = 15 W
M = 251
1031
GPS
Set 017M
Dft 2.3
M = 239
V = 15 W
T = 224
60D = ST
D = 10.0 X 31 / 60
D = 5.16 = 5.2
T = 002
= 15 W
017
BBG7
V
M=
60D = ST
S
= 60 X 1.2 / 31 S
= 2.3nm
Exercie 9-2
Set
T
= 355
V = 15 W
M = 010
Plot waypoints R”4” Fl R 6s BELL as BBR4 and G“7”
Fl G 4s as BBG7
Speed of advance is 9.9kn,
Set 010M
Dft 2.1
Set is 010ºM and drift is 2.1kn.
Course T
= 227
V = 15 W
M = 242
What is the course to steer?
What is the required boat speed?
Qualify the course.
BBR4
What would you do?
COG
T = 236
V = 15 W
M = 251
BBG5
BBG7
Exercise 9-2 (another solution)
Set
T
= 355
V = 15 W
M = 010
Plot waypoints R”4” Fl R 6s BELL as BBR4 and G“7”
Fl G 4s as BBG7
Speed of advance is 9.9kn,
Set is 010ºM and drift is 2.1kn.
Set 010M
Dft 2.1
Course T
= 240
V = 15 W
M = 255
What is the course to steer?
What is the required boat speed?
Qualify the course.
BBR4
What would you do?
BBR6
Track
T
= 211
V = 15 W
M = 226
BBG7
Track
T
= 250
V = 15 W
M = 265
Exercise 9-3
SRR2
1030 – 0945 = 45min
1100
Set 132M
Visual 60D = ST
D
Dft 1.5
= 6.8 X 45 / 60
D
= 5.1
Plot waypoints RN”2” (Shark River) as SRR2 and
Set 132M R“2” Fl R (Oyster River) as ORR2 – depart ORR2
Dft 1.5 at 0945.
1100 – 0945 = 0115 = 75min
60D = ST
= 60x6.6 / 75
S = 5.27 = 5.3kn
1030
GPS
S
T = 175
V = 15 W
M = 190
T = 117
V = 15 W
M = 132
60D = ST
S = 60x1.1 / 45
S = 1.5
T = 014
V = 15 W
M = 029
ORR2
T = 159
V = 15 W
M = 174
Minimum speed to arrive RN”2” by 1100? 5.3kn
You leave with boat speed of 6.8kn.
At 1030 your GPS position is L 41º 41.7’N
71º 58.4’W - determine current set and drift.
You fish and end up at GC”3” at 1100 and decide to
head back to ORR2 at a reduced speed of 4.0kn.
Assume set/drift remains the same.
What is your DR course to ORR2? 190M
174M
What is your COG and SOG to ORR2?
5.0kn
1214
What is your ETA at ORR2?
60D = ST
= 60x6.2 / 5.0
74
0945
Visual
Lo
T
T=
1100 + 74 = 1214
Questions ? … Comments
Slide 34
Homework
 Finish Weekend Cruise
 Next Class – 24 May
Slide 35