international maps?

From: Thomas A. Troszak (tom@bullhammer.com)
Date: Mon Sep 25 2000 - 06:44:32 PDT

  • Next message: Mike Bevan: "Obs 24/09/00"

    chiayk@pop.singnet.com.sg wrote:
    > 
    > Hi Tom:
    > Thanks for the information. I am dis-advantage since I am only
    > 1.445 degree North of the equator and couldn't have polaris in sight.
    
    I should have noticed that you are out of view of Polaris, sorry. (oh,
    yeah, Singapore!)
    
    I tried to do some surveying once and found that even the precision
    magnetic compass on a survey theodolite is completely useless.  I once
    went around a twenty acre piece of land twice before I realized that the
    metal clip on the pen in my pocket messed up the compass.  Therefore,
    with no Polaris, you must use some kind of ground reference as you
    mentioned.  
    
    Here in the U.S., we have access to very accurate Geological Survey maps
    which are useful for such tasks.  The thought occurs to me that the maps
    that airline pilots use (called sectionals ?) are also extremely
    accurate and are possibly available world wide.
    
    I know that the U.S. versions include landmarks such as water towers,
    radio towers, etc. which could help in orienting oneself on the ground. 
    Would any pilots on the list care to comment on the availability of
    international maps?
    -- 
    Tom Troszak, 
    Asheville, NC, USA
    35.601 N, -82.554 W
    mailto:tom@bullhammer.com
    
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