You are planning a voyage between Portland, LAT 46° 05' N, LONG 124° 00' W, and Korea via LAT 44° 00' N, LONG 155° 00' E. Which statement is TRUE? (Use gnomonic tracking chart WOXZC 5270)
• Great circle vs. composite sailing on a gnomonic chart • How to find and interpret the vertex of a great circle • How distance is measured on Mercator vs. gnomonic charts
• On the gnomonic chart, what does a great circle track look like, and how do you transfer it to a Mercator chart? • Where does the great circle between the given positions reach its highest latitude, and how does that compare with the position of the Aleutian Islands? • When using mid-latitude to measure distance in segments, is this standard for gnomonic or Mercator practice?
• Plot both positions carefully on WOXZC 5270 and sketch the great circle to identify its vertex latitude • Note whether the great circle track passes north or south of the Aleutian chain • Review how composite sailing works: a limiting parallel (e.g., 52° N) and where straight rhumb lines can be used between specific longitudes
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