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tawm

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As OP hasn't replied yet, I'll take the liberty. The biggest issue is interference (jamming) by malicious actors. This is especially common in the eastern Mediterranean [1]. Earlier this year there have also been reports of interference on Finland's border with Russia [2].

Of course one could imagine other scenarios where GPS might become inaccurate or unavailable on a larger scale, such as an attack on the satellites themselves.

[1] https://safety4sea.com/us-marad-gps-interference-incidents-r...

[2] https://www.traficom.fi/en/news/unusual-amount-reports-about...

(my guess is that _moof is a navigator with experience in the eastern med sea)

9-Euro-Ticket 4 years ago

Definitely take a shower right before departure. Your ass will thank you.

Shopping Sucks Now 7 years ago

It’s gotten to the point where I trust eBay more.

Absolutely! I recently bought a simple item, a roll of wiring loom tape. It was on Amazon and had a few reviews that stated that the received tape was old and didn't stick very well anymore.

Same item on eBay for cheaper has the seller specifically mentioning that they only sell fresh tape from the running production, not old stock. Even better, the seller specialized in these (and other) tapes.

It seems that eBay has just cultivated a much higher quality base of vendors. Many of them seem specialized.

Urbit 7 years ago

It's ok to disagree and fervently oppose but it's unfortunate when we descend into soundbite mud-slinging in service of that opposition.

And where does anyone do that? As far as I'm concerned your post is just concern trolling.

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Thank you for this valuable comment. It is highly likely that police would go for the lower hanging fruit of buyers instead of sellers in a system so opaque and decentralized. The old thinking of "what could happen, they only want the big guys anyway" should have no place in OpSec. And when information on these networks is so hard to come by to begin with, a buyer being busted is very desirable. The way I see this "evolution" of the dark markets, is that it mostly protects vendors while inconveniencing and endangering buyers.

Why is looking things up in a table sad?

For the purpose of astro nav: NP303 is calculated for an epoch of 5 years (and it's only 3 books). Until its end of life, it has to be "updated" in the sense that corrections need to be applied as they are released.

I don't think the point of the books has ever been disaster proofing. For the most part, books were good enough for the job before computers and still are. They're cheap, come from trusted sources (and it's easy to verify that they're legitimate), and they're easy to correct should they have errata.

Windows PCs and excel spreadsheets are used in navigation all the time. Nobody's forcing navigators to use books. If they do, though, they probably have a good reason for it.

You make it sound like it's impossible to regulate these things at sea. That is simply not true and very much possible. For example, right now the highest allowable sulfur content for bunker fuels used outside of ECAs is 3.5%. Obviously this requirement will be tightened further in the future.

The 91 hour limit comes from the MLC:

"Rest hours: rest hours should be implemented in national legislation. The maximum hours of work in that legislation should not exceed 14 hours in any 24-hour period and 72 hours in any seven-day period, or: at least ten hours of rest in any 24-hour period and 77 hours (rest) in any seven-day period. Furthermore, the daily hours of rest may not be divided into more than two periods and, at least six hours of rest should be given consecutively in one of those two periods."

7*24-77 = 91