NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Mike Boersma
Date: 2013 Aug 3, 12:10 -0700
As Easter Island is roughly 40d East of Tahiti and 10d South of Tahiti, the easiest and inexpensive non-technical method would be to give each navigator a chart (and Sailing Directions) placing Tahiti at roughly 27dS109W, the location of Easter Island. As the navigators would presumably not have access to any other navigational planning information, assuming every other navigational resource they had worked perfectly, they would end up at Easter Island.
More Rube Goldberg solutions might involve:
1) With a correct chart and Sailing Directions, give each Navigator a "chronometer" that gained a significant amount of time each day (almost 2.5 hours by the time they reach Tahiti), but not so much time that the navigator would notice.
2) Provide each navigator an "almanac" that starting on August 4 would advance the GHA of the sun, moon, planets, and stars by roughly 2.5 hours (so they would go East to 109d W, the longitude of Easter Island. The alterations in the almanac would need to match the acceleration of the chronometer...Declinations would also have to be massaged so that the navigator would unwittingly not miss the fact that he went 10d further South...
Clouds would be very useful (more DR required)-- weather manipulation by the clever hacker?
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