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## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: more Leg 57 results
From: Dan Hogan
Date: 1999 Aug 19, 13:26 EDT

```>Here are the rest of my results for Silicon Sea Leg 57.
>
>4.  ETA Cape Horn = Mar 26 0230 Z, Mar 25 2230 ZT.
>
>I divided the 297 miles measured on plotting sheet by 11.1 kt speed
>(10.3 kt plus .8 kt current practically on our stern).  Since the
>current was stated, I assumed we were supposed to use it.
Your procedure is OK. But doing distance measurement on a plotting
sheet for more than a 2 degree area introduces large errors due to the
scale. AND as I remember the error gets much worse on a small boat
under sail in moderate weather.
>5.  Distance from 2342 Z fix to Cape Horn = 297 nm.
See 4. above.
>6.  Compass course = 100.
Within tolerance. But you can get more accuracy using one of the
Sailings methods for DR.
>7.  TC & dist to decision waypoint = 76 deg, 146 nm.
Same as 6. above.
>Constructed a new plotting sheet for this question.
>
>8.  Compass course = 66.
OK
>The problem says drift is "0.8 Kts/day".  I assumed this meant 0.8
>kts.  My E-6B says we should angle 2 deg right to correct for that
>much current.  Subtract the total compass error of 12 E to obtain
>answer.
AArrgghh! Yes the current *IS* 0.8Kts. Forget the per day thing.
The new Pilot Charts list current in Kts as read on a knotmeter.
Dan Hogan WA6PBY
C27 "Gacha"
dhhogan{at}XXX.XXX
Navigation-L: http://nav.cnchost.com
```
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