NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Navigating Around Hills and Dips in the Ocean
From: Richard M Pisko
Date: 2003 Aug 16, 23:08 -0600
From: Richard M Pisko
Date: 2003 Aug 16, 23:08 -0600
On Sat, 16 Aug 2003 18:27:33 +0100, Dr. Geoffrey Kolbe wrote: >For a map of the lows and highs of the ocean's surface, see: >http://www-aviso.cls.fr/html/applications/geophysique/199901_uk.html > In the text is the statement:"These differences can generate sea level variations of over 100 meters between two ocean regions thousands of kilometers apart. " >But there seems to be an anomaly in the map shown. The map of the world >(shown on the left) is colour coded and there is a colour scale to the left >of the map which ranges from +80 to -80 metres. This would seem to accord >with David Hoyte's statement that the mean surface of the oceans does vary >by up to 200 metres. But the map on the right is a detailed blow up of the >Indian Ocean. This is also a colour coded map, but the scale to the right >of the map only ranges from +5 to -5 metres. This map shows a range in >height over the Indian ocean of around 10 metres, whereas the large world >map shows a variation of at least 80 metres for the same region. There >would appear to be an error here somewhere. > Yes, your eye picked that up where mine would have passed over. Thank you. -- Richard ...
