# NavList:

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

Message:αβγ
Message:abc
 Add Images & Files Posting Code: Name: Email:
Re: Silicon Sea: Leg 85
From: Dan Hogan
Date: 2002 Nov 14, 06:10 -0800

```On 12 Nov 2002, at 14:30, Paul Hirose wrote:

> 1. Total distance from Hanalei Bay to L.A. Light = 3990 miles

Too high. waht method are you using for calculations? Try using Mid-Latitude
leg-by-leg.

> 2. Based on a Speed of 10 Kts it will take 16.6 days to L.A. Light.

See Q1.

> 3. At 7.5 gallon/day total water consumption, total to the L.A. light
> will be 125 gallons. The vessel has a 220 gallon capacity, so there
> appears to be enough.

OK
> 4. TC from Hanalei Bay to MOP1 is 013.

OK

> 5. Departure was at local apparent noon.

Right

> 6. TC to MOP1 = 014.

OK

> 7. Steer 1 degree left for current and subtract 11.5 deg compass
> error. Compass course = 002 to MOP1.

OK

>
> Mostly I used plotting sheets and did the computations graphically.
> For the current correction I'd normally use an E-6B slide rule, but
> this time I drew a current triangle on the plotting sheet for the
> sake of variety.

If you like plotting sheets and non-calculator try Mid-Latitude for the leg
calculations.

> Looking at the answers, my distance was about 25% off. Even on
> plotting sheets I think I should have done better. May have made a
> mistake. At least I got the initial course right within a couple
> degrees. As an instructor told my class many years ago, the most
> important output from any nav system is "which way do we go".

Saiboat compasses are divided into 5 degree increments, sailing closer than
2.5d to that is guess work.

Dan Hogan WA6PBY
C27 "Gacha"
dhhogan1---.net
Nav-L Page: http://www.wa6pby.com

```
Browse Files

Drop Files

### Join NavList

 Name: (please, no nicknames or handles) Email:
 Do you want to receive all group messages by email? Yes No
You can also join by posting. Your first on-topic post automatically makes you a member.

### Posting Code

Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
 Email:

### Email Settings

 Posting Code:

### Custom Index

 Subject: Author: Start date: (yyyymm dd) End date: (yyyymm dd)