NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Silicon Sea: Leg 70
From: Yves Arrouye
Date: 2001 Apr 23, 1:23 AM
From: Yves Arrouye
Date: 2001 Apr 23, 1:23 AM
> 1) What is the total distance in nautical miles to Cristobal? > -- ---------------------------------------------------------- Using great circle sailings: Leg 1: 287.1d 84 Nm Leg 2: 264.4d 519.9 Nm Leg 3: 228d 712.3 Nm for a total of 1316.2 Nm. > 2) How many days (to the nearest tenth) is it to Cristobal? > -- -------------------------------------------------------- At 7.5 knots, that's ~ 175 hours -> 7.3 days. > 3) What is our Zone Time(ZT) ETA at the St. Lucia/St. Vincent > Pass waypoint? > -- ----------------------------------------------------------- Looking for sunrise in the Nautical Almanac, sunrise is 0532 at this latitude. With current, our true course will be 287d at 8.7 knots. The sail will take us 9:39 hours. The ETA is thus 1511 ZT. > 4) What is the Compass Course/Course-to-Steer for the Pass? > -- -------------------------------------------------------- 302, our TC being 287. > 5) What is our Departure point position to the nearest minute? > -- ----------------------------------------------------------- 13d 25 N 61d 30 W I used a plotting sheet printed from Ed Falk's site. I don't think I can be precise to a minute of arc on these things printed as 8.2 x 8.2 inches. Can you? > 6) What is the TC from our departure point to MOP1(12d 30.0'N 70d > 00.0'W)? > What is the distance? > -- --------------------------------------------------------------- TC 264.7 Distance 500 Nm. > Var 13dW, Dev 1.5dE. Current Set 270d, Drift 0.7 Kts. > > 7) What is the Compass Course(CC)/Course-to-Steer for MOP1? > -- -------------------------------------------------------- Assuming we still have a speed of 8.1 knots, CMG is 265 true at 8.8 knots. If CMG is 265, CC is 276.5. YA
