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Search took 0.00 seconds. Search: Posts Made By: S/V Alchemy
Forum: Seamanship & Boat Handling 18-02-2011, 09:33
Replies: 73
Views: 7,399
Posted By S/V Alchemy
That's just one flare, after a lengthy period of...

That's just one flare, after a lengthy period of low solar flare activity.

Here comes the sun: Solar flares make way to Earth - The Globe and Mail...
Forum: Seamanship & Boat Handling 17-02-2011, 16:02
Replies: 73
Views: 7,399
Posted By S/V Alchemy
It's a reminder. Solar wind and flare activity...

It's a reminder. Solar wind and flare activity can damage satellites like the GPS constellation or simply by swamping their transceiver frequencies. LEO constellations like Globalstar and Iridium can...
Forum: Seamanship & Boat Handling 16-02-2011, 11:29
Replies: 73
Views: 7,399
Posted By S/V Alchemy
Of course it isn't. Child midshipmen were taught...

Of course it isn't. Child midshipmen were taught it for hundreds of years in the Royal Navy. That meant learning long-form sight reductions, not the four-function easy stuff we can do today. Learning...
Forum: Seamanship & Boat Handling 15-02-2011, 20:47
Replies: 73
Views: 7,399
Posted By S/V Alchemy
Absolutely, but the prudent mariner relies on a...

Absolutely, but the prudent mariner relies on a mixture of navigational techniques to obtain decent fixes.

This implies a familiarity with a mixture of techniques beyond "one".

A lot of people...
Forum: Seamanship & Boat Handling 15-02-2011, 20:43
Replies: 73
Views: 7,399
Posted By S/V Alchemy
The idea that you could convince 19 guys to...

The idea that you could convince 19 guys to hijack four jets on the same morning in the 21 century probably seemed far-fetched...you know, before it happened.

Impact of January GPS Glitch on US...
Forum: Seamanship & Boat Handling 14-02-2011, 08:10
Replies: 73
Views: 7,399
Posted By S/V Alchemy
They don't have to fall from the sky. Some of...

They don't have to fall from the sky. Some of them are quite old and merely have to be taken out by a decent-sized solar flare or cosmic-ray burst.

Nonetheless, it's governments who press the...
Forum: Seamanship & Boat Handling 13-02-2011, 11:27
Replies: 73
Views: 7,399
Posted By S/V Alchemy
There are a variety of forms available that...

There are a variety of forms available that require only addition and subtraction and the inputs from sextant, clock, almanac and HO229/249 and Table 5, etc. for the fine tuning.

You can find your...
Forum: Seamanship & Boat Handling 12-02-2011, 22:23
Replies: 73
Views: 7,399
Posted By S/V Alchemy
I own an Astra IIIB, a Freiberger Yachtmaster and...

I own an Astra IIIB, a Freiberger Yachtmaster and a Davis plastic one for my son/the liferaft.

I get pleasure out of the math and the craft.

We are still on Lake Ontario. I manifestly don't...
Showing results 1 to 8 of 8

 
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