# NavList:

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

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Re: Silicon Sea Leg 69: ANSWERS
From: Dan Hogan
Date: 2001 Apr 10, 01:26 EDT

```On 9 Apr 2001, at 15:59, Yves Arrouye wrote:
> Dan,
>
> For the newcomers here like me, could we get the inner workings of the
> solution to what may be our first problem? That would really be nice.
Go to page http://www.angelfire.com/nt/navtrig/index.html, it's an example of
a Silicon Sea problem.
> I did questions 1, 2, and 4, and then when the solution came here, I kind
> of lost interest :) (It would be great to wait more than 5 days to give a
> solution; maybe a full week?).
I have no argument. At one time members were asking for a quick response
> Below are some of my questions.
>
> > 1. FIX= 9d 50.0'N  53d 00.2'W
> >
> > 2. TC= 298.1d
> >    Dist= 424.6 Nmi
>
> I tried to apply the mid-latitude sailing formula from 4mulas.txt and got
> TC = 298 but Dist = 379 Nm. I would appreciate if somebody could see if I
> made an obvious error, and also explain what method was used (w/
> reference) to get to the above numbers if mid-latitude sailing wasn't used
> (maybe it doesn't make sense to use it?).
Make sure that you calculated Diff in Lat, the DLo and Mid-Latitude(Lm)
correctly. I get D= 419.1 Nmi and TC= 298.5d using my Mid-Latitude. Also
most Tables are calculated to 4 places using one-place can tend to
accumulate error if the calculations are strung together.
Dan Hogan WA6PBY
Catalina 27 "GACHA"
dhhogan@XXX.XXX
http://www.wa6pby.com
```
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