11 Electronics Homework Q

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Before Casting Off- Electronics -
Homework Q A
Junior Navigation Chapter 11
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Objectives Know the electronic tools available
to the offshore navigator. Be aware of the
major features of offshore navigation software.
Be aware of the methods of communication
available to the offshore navigator. Know how
weather information can be obtained at sea. Be
able to develop a checklist of navigational
equipment and supplies to have on board. Be
able to prepare a checklist of tasks that should
be completed in advance of an ocean passage.
Understand that the USPS Weather, Marine
Electronics, Engine Maintenance, and Cruise
Planning courses are essential before embarking
on an offshore voyage.
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Practice Cruise Part 1 The Homework for this
Chapter consists of planning for your Practice
Cruise, which you will continue as the homework
in Chapter 13. In working this homework and
developing the voyage plan, you will need to
reference the material in Chapters 10 and 11 of
this course. Some parts of this exercise do not
require a specific answer, but only that you
enter information in your Navigators
notebook. After you complete this voyage plan,
keep this information available in your
Navigators notebook for your use in completing
the Practice Cruise in Chapter 13.
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Practice Offshore Cruise Planning You intend to
take an offshore cruise next summer, and want to
start planning the voyage now. For this planning
portion of the cruise, you will need the pilot
chart for July from your student materials,
plotting tools, and a notebook that will serve as
your Navigators notebook. If you have a
hand-held GPS available, you may want to use that
for the "Optional" questions in this exercise.
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1. You are planning a July cruise from Marthas
Vineyard, MA to Bermuda. You have planned the
offshore part of the voyage to begin at L 41 00
N, Lo 70 30W, and end well offshore of Bermuda
at L 3300N, Lo 65 00W. Plot these initial
and destination coordinates on your copy of the
July pilot chart. a. What is the true course for
the rhumb line between your initial and
destination coordinates? b. What is the
expected magnetic variation along this
course? c. What would be the planned magnetic
course along this rhumb line course?
151 15W 166M
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Problem 1. Continued from previous slide d. What
is the distance of this course? length of rhumb
line measures 910 on the latitude scale of the
pilot chart 550nm e. Assuming an average speed
made good (SMG) of 6.0 knots along the rhumb line
course, what will be your elapsed time, in hours,
to complete this voyage? 91.7 hrs
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Problem 1. Continued from previous slide f1.
(Optional) Using your GPS, determine the
true bearing, distance, and elapsed time for this
voyage. Hint Put your GPS in Simulator mode,
enter the initial and destination coordinates as
waypoints, input the speed 6.0 kn, and create a
route between the two waypoints. True bearing
of course is 150 Distance 547nm Elapsed time
for voyage 91.2 hrs
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Problem 1. Continued from previous slide f2.
(Optional) Using the Law of Cosines, determine
the true bearing, distance, and elapsed time for
this voyage. Hint Destination coordinates are
equivalent to the GP of a body therefore
GHA Lo 65W, DEC L 33N, DR Lat 41N
DR Lo 70 30'W LHA GHA DR Lo W
65-70.5 360 354.5 DEC 33N Hc
80.87839, Z 149.63242, Zn 150 Co_Alt 90
-Hc Co_Alt 9.12161, Distance Co_Alt x
60nm/ True bearing of course Zn
150 Distance 9.12161 x 60nm/
547.3nm Elapsed time for voyage 91.2 hrs
This confirms that your GPS uses the Law of
Cosines for calculating Course Distance
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Problem 1. Continued from previous slide g. At a
point on the rhumb line 180 nm from your initial
point, what will be the most probable
wind direction? ____ average wind force, on
the Beaufort Scale? _______ prevailing set
of the ocean current?____________ mean drift
of the ocean current?______
SW
Force 4
058 to 062
1.5kn
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Problem 1. Continued from previous slide
h. You study the pilot chart and see that this
course crosses three major shipping lanes.
1. What are the names of these routes, and
approximately how far from your initial point
will you enter these shipping lanes?
Cape Hatteras to Virgin Rocks 200 nm from
initial point. Cape Hatteras to Gibraltar
300 nm from initial point. Bimini Island to
Bishop Rock 460 nm from initial point.
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Problem 1. Continued from previous slide
h2. For the Cape Hatteras to Virgin
Rocks shipping lane, what are the coordinates
of where your route intersects the shipping
lane? L37 50'N, Lo 6820'W
h3. What is the rhumb line course of this
shipping lane, at the point where your route
intersects it? 058
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Problem 1. Continued from previous slide
h4. For the Cape Hatteras to Gibraltar shipping
lane, what are the coordinates of where your
route intersects the shipping lane? L36 40'N,
Lo 07 20'W
h5. What is the rhumb line course of this
shipping lane, at the point where your route
intersects it? 071 You note this
information in your Navigators notebook. You
also enter the coordinates of a point several
miles before entering these lanes as alarms in
your GPS (optional).
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2. Continuing with your planning, you determine
which charts you will need for this
cruise. Departure Since you are leaving from
your home waters, you have all the necessary
charts and tide tables for the Departure phase of
the voyage aboard the boat however, being a
prudent navigator, you check the inventory just
the same. You list these charts in your
Navigators notebook, in the sequence you intend
to use them. Offshore You decide to divide the
offshore portion of this voyage into three
segments. You plan to use Universal Plotting
Sheets (discussed in Chapter 13) to plot your
progress during the offshore leg of the voyage,
and confirm that you have a supply of these
plotting sheets on board.
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Problem 2. Continued from Previous
slide Landfall In planning for Landfall, you
determine the charts you will need that cover the
approach to Bermuda and you obtain them. These
charts are Chart 26340 Approaches to
Bermuda Island Chart 26341 Bermuda
Island a. Which sources would you check to
procure these charts for the Bermuda area?
These charts (paper) can probably be obtained
from either Pilothouse Charts or Landfall
Navigation. If you intend to use electronic
charts with your navigation software, check with
your software provider for these charts of the
Bermuda area.
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3. Publications You decide to take the Coast
Pilot for your home area with you, which you
already have. You also decide you need to acquire
the Sailing Directions - Planning Guide, as well
as Sailing Directions Enroute, for the Bermuda
area. Since these publications are available from
the NGA website, you download the applicable
sections of these publications to your computer
and study them as you continue your voyage
planning. a. What additional publications should
you consider for this voyage? Bowditch,
Cruising Guide for Bermuda, Reeds Nautical
Almanac, and a copy of the Navigation Rules
(Inland and International).
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4. You check the navigation equipment aboard the
boat and prepare the following list of whats
available for your use. Installed GPS receiver
Radar receiver Computer Sonar depth
sounder Navigation software Steering
compass Auto steering system Knotmeter a. What
additional navigation equipment and tools should
you plan to take with you on this voyage?
Backup handheld GPS receiver (2) Handheld
bearing compass Deviation Table for steering
compass Sextant Watches (2) Nautical
Almanac Calculator for sight reductions See
( Table 11-2)
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5. List navigational plotting and record-keeping
tools you should plan to take. Navigators
notebook Universal Plotting Sheets CLS
Small Area Plotting Sheets Plotting tools
Graph paper Pencils Erasers Waterproof
pocket notebooks Pre-printed worksheets or
forms Notebooks or scratch paper Deck Log
Sight Logs
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• 6. You check the communications equipment and
  tools aboard the boat and prepare the following
  list of whats already available to you.
• Main VHF radio, without DSC (mounted)
• SSB transceiver
• a. What additional communications equipment and
  electronic safety equipment should you plan on
  taking with you on this voyage?
• Handheld VHF radio, with DSC (be sure you obtain
  an MMSI)
• Satellite telephone research and find the best
  provider for your needs.
• EPIRB
• Internet access
• Operating manuals

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7. Accessing weather information at Sea. You
check the NOAA website, locate the information
you need and enter the information for accessing
the NOAA weather forecasts in your Navigators
notebook. You plan to receive the NOAA radio fax
transmissions at ZT 0024, 0428, 1052 and 1652
each day while at sea. You also note the
broadcast times and frequency of other weather
sources youve identified during this phase of
planning in your Navigators notebook. You
confirm that with the communications tools you
either already have on board or will acquire, you
have the means to access this weather
information. However, you need to make
arrangements for an internet provider that can
provide service to you at sea.
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• Problem 7. Continued from previous slide
• a. What are some possibilities of internet
  providers for this voyage?
• If you are an Amateur Radio operator with at
  least a General class license, you already have
  access to the internet on the appropriate bands
  of the SSB radio. Otherwise, the following
  provide the service, for a fee
• SailMail
• SeaWave
• MarineNet Wireless
• ShipCom

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8. The voyage is now only a few months away. You
review your charts for the Departure and Landfall
phases of the voyage. You are familiar with
the aids in your home waters you enter the
coordinates of the Departure navigational aids in
your Navigators notebook.
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Problem 8. Continued from previous slide While
studying the charts for Landfall, you note that
the northern approach to Bermuda is shoaled and
the only safe approach to Hamilton Harbor is from
the West. You note the height of the following
lights in the event you arrive in the area at
night, and enter this information in your
Navigators notebook North East Fl 3s 45
ft St. Davids Fl (2) 20s 213 Ft Gibbs Hill Fl
l0s 345 ft
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Problem 8. Continued from previous slide You
now research entry requirements for Bermuda. You
access a Bermuda website, www.bermudatourisrn.com
and locate information on contacting Bermuda
Maritime Operations Centre for information on
making radio contact with the centre before
approaching the coastline. The webpage includes
the following contact information, which you
enter in your Navigators notebook Tel (441)
297-1010 Fax [phone] E-mail
operations_at_rccbermuda.bm (Duty Officer 24
hours) Telex INMARSAT C (581) 431010110 Telex
INMARSAT C (584) 431010120 MMSI 003100001 (MF
and VHF DSC) SSB R/T 2,182 kHz or 4,125 kHz
USB Marine VHF Channels 16 or 27
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Problem 8. Continued from previous slide You
also confirm the address and contact person where
the captain made arrangements for a slip in
Hamilton Harbor. No specific answer required.
Information entered into Navigators notebook
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9. The weekend before the start of the voyage,
everyone involved in the voyage participated in
the shakedown cruise. During this time, you
Had the captain swing the boat so you could set
up a Deviation table (Chapter 13). Tested
each electronic navigation instruments and
confirmed that it operated correctly. Confirmed
you had backup equipment for all navigational
components, and the tools to install them.
Confirmed that backup software and instruction
manuals were onboard. No specific answer
required. Information entered into Navigators
notebook END OF PLANNING FOR THE OFFSHORE VOYAGE
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Q7
Before Casting Off- Electronics -
End Of Homework Q A
Junior Navigation Chapter 11