Re: Longest straight line sail...
Do you think anyone would be crazy enough to sponsor this as a race?
As an independent voyage, it would be a huge challenge.
The line does seem to pass through many national economic zones. Does it come within territorial seas en route?
I love what Noonsite has to say about places along the route such as Tanzania: "Yellow fever vaccination certificate is required. Malaria prophylaxis is recommended. It is not advisable to swim in fresh water, because of the danger of the bilharzia parasite. AIDS is endemic in East Africa. Do not drink tap water."
A steel hull would sound good -- especially if thick enough to stop bullets.
Of course, any plans for such a voyage would probably spawn LOTS of cruising-related Gun, Pirate, Terrorism, Political, and Religious comment threads.....