Welcome to the NavList Message Boards.

NavList:

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

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Another super-accurate AH candidate hiding in my pocket!
    From: Paul Saffo
    Date: 2014 May 5, 18:21 -0700

    Okay, so I am a geek, teach in an engineering school and live in silicon Valley, but here is one to try...

    The iPhone 5 has a nifty level built into it's compass app, and one can choose among several level apps for the iPad. I haven't tried to measure their accuracy, but a simple test (slide a sheet under the paper of the iphone/pad) suggests that it is pretty sensitive.

    Soooo... I tried getting a sight this eve as the late afternoon sun was sailing among the clouds. My iPhone was a challenge owing to its small screen size, and the plastic screen protector on top of the glass contributed mightily to the distortion. No screen protector on the iPad though, and its large surface area made a fine target! Still... it is hardly a first surface mirros and thus the sun's image is kind of distorted. Well, actually quite distorted, but not so horrible that it is a lost cause. By moving the image around the surface, I occasionally even got a vaguely round disk!

    But despite the distortion, the iPhone 5 is actually an extraordinary artificial horizon. At the bottom of the compass screen is a lat/long readout -- it thus provides a reliable position even when the skies are clouded over. Now, what other AH can claim that level of accuracy! ;-)

    -p

    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    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)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site