Next message: Peter Fogg: "Re: Cell phone time, dip at beach!"
I have used a rope, a level and a tape measure. I've also stood at the
waterline, shot a mental line along a level to a point up the beach from my
eye height, walked to that point, and done that sequentially until reaching
the sextant sight point (for a height of eye of 17' on a walkway up the
beach).
Jim Thompson
jim3 at jimthompson dot net
www.jimthompson.net
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-----Original Message-----
From: Navigation Mailing List
[mailto:]On Behalf Of Zvi Doron
Sent: April 10, 2005 2:31 PM
To:
Subject: Re: Cell phone time, dip at beach!
The way I do it is to ask a person of a known height to stand at the water
edge and sit myelf at a position up the beach where the top of their head
touches the horizon. Because of dip this is probably not super accurate but
appears to be good enough for pactical purposes. Trying to estimate you
height above the water without a reference is more difficult than one would
imagine.
----- Original Message -----
From: Mike Burkes
To:
Sent: 10 April 2005 15:37
Subject: Cell phone time, dip at beach!
HI folks! I have a few commments and questions I wish to post to List:
1.For a while I was unable to obtain precise time therefore used cell
phone time in order to make a few sun shots at beach and lo and behold time
was in synch with subsequent recovered precise time! If anyone has feedback
as to how cell phone time is determined I would be interested! Also thought
I would pass this info along since I now know cellular time to be an
excellent back-up!
2.Dip at beach: This issue may have been batted around the List before
but is there a prescribed method of determining height of eye for dip
correction at beach? I would venture a guess if elevation is known at that
precise spot that would be one way but I try to get as close as possible to
water in order to minimize eye height.
Thanks much your responses will be much appreciated!
Mike Burkes
