ASA 105: Skill 2, Locating resources

 


2.Identify a source of official U.S. Coast Guard navigation publications.

Companies such as Landfall Navigation, Paradise Cay Publications, International Marine, and OceanGrafix supply many printed US Government authorized maritime publications.  These include Light Lists, Tide Tables, NOAA charts, and Coast Pilots.  Links follow.

https://www.mhprofessional.com/international-marine
https://www.landfallnavigation.com/navigation/navigation-books-guides.html
https://www.paracay.com/nautical-charts-and-books
https://www.amnautical.com/pages/u-s-government-publications
https://www.oceangrafix.com/products/coast-pilot
https://www.oceangrafix.com/products/light-list
https://www.oceangrafix.com/products/tide-tables

Unofficial resources are cruising guides and Eldridge Tide and Pilot which has very detailed information about the US East Coast.  The book is updated each year.



Comments

Post a Comment

Popular posts from this blog

ASA 105: Skill 10, Calculating Deviation

Image
  10. Check compass deviation by a transit bearing or other means. Compass deviation is how we address the magnetic field of a vessel.  Deviation may change over time as the magnetic field of the yacht changes.  This is more common for steel or wooden hulls fastened with iron than for fiberglass yachts.   There are two basic ways to check deviation.  The first and oldest is by using a table of the sun's true bearing at sunrise and sunset for a given latitude.  The other is by using a charted range (transit bearing).  We will look at the range method. Nantucket Harbor Channel Range This is similar to the range used in the example, Cleveland Ledge Channel Range. The yacht should move right to get the ranges aligned The TVMDC AW formula is used.  When D is unknown, the arithmetic result is D using TVMDC.  In such a case, TVM and C are knowns so we solve for D. Turning to Chart 1210 Tr, observe the charted "Cleveland Ledge Channel" range for...
Read more

ASA 105: Skill 7, Aids to Navigation, Unlighted marks

Image
7. Explain the significance of shapes, colors, and lights used in the U.S. Aids to Navigation (ATON) system. Nun buoy Conical top is a requirement for nun buoys.  If marking a channel they have even numbers are red in color and are left to starboard when entering, port when departing. Ready references include: Chart One , Page 125  Eldridge 2022,  Page 214 Boat Navigation for the Rest of Us, inside flaps and back cover Shapes and colors are important for day piloting.  Lights on buoys are often correlated to the color of the buoy itself. Nuns have conical tops.  Red nuns with even numbers are lateral marks denoting the left side of the channel when heading seaward.  Nuns are not lighted. Cans have cylindrical tops.  Green cans with odd numbers denote the right side of the channel when proceeding seaward.  Cans are not lighted. Tower buoys may have a sound signal or a light or both.  The color denotes the buoy's significance.  Red or Gree...
Read more

ASA 105: Skill 9, Measurements

Image
  9. Measurements:  Convert courses and bearings between true, magnetic, and compass.  Determine Latitude and Longitude.  Measure distance. Nautical measurements on a chart are either Angular or Linear .  Courses are angles and distances are linear.  The other vital nautical measurement is Time given in hours and minutes. Leading lights, such as this pair in Nantucket, are a guide for staying in the channel.  They may be used to check you compass deviation.  In that instance we use a line, the range, to correct an angle, compass deviation. The first measurement for navigators is True North.  The longitude lines on the chart are North/South lines.  The North Pole is an absolute.  Compasses, however, don't point at the North Pole, they point at the Magnetic Pole which shifts ever so slightly each year.  The inner rose of the compass rose printed o a chart represents the Magnetic Pole and shows the Variation from True North. Com...
Read more