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Old 23-03-2011, 13:16   #106
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Re: Magnetic North Shift

An interesting aside; Apparently cows prefer to stand facing north due to some internal magnetic sense they have. They experimented by enclosing a cow in a round pen surrounded by an electromagnetic field and when the shifted the artificial north the cow followed it. Hmm how do i get a cow on the boat and can I sell the milk? Do I need to do a deviation table?
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Old 23-03-2011, 14:14   #107
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Re: Magnetic North Shift

To get milk, after the first ten months, you're going to need to take a bull along.
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Old 23-03-2011, 14:24   #108
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To get milk, after the first ten months, you're going to need to take a bull along.
Are you looking for a job?
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Old 23-03-2011, 14:36   #109
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Re: Magnetic North Shift

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Are you looking for a job?
Nope. After milking cows for the first 29 years of my life, I've shoveled enouth s*** to last a lifetime.

Hmmm -- maybe THAT'S why I like this forum!!
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Old 23-03-2011, 14:40   #110
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Re: Magnetic North Shift

Quote:
Do I need to do a deviation table?
No, you need hay and a shovel It's been done - 500 years ago. Today they call it powered milk. You can get it with added butter fat and it's not really bad.

The earths poles migrate naturally on a 26,000 year cycle (Procession). Variations in the core of the planet also causes variations in the magnetic field as well. It really was not until the early 20th century that it was even mostly understood. That people could travel with a compass it amazing in itself. But not really.

For the most part navigation was / is by "routes". They change by the season and are mostly traditional. You really are not out to fight the planetary, seasonal, or Coriolis effects as you travel about the globe. It's all summarized by Pilot Charts that you can get free from NOAA. It's what all the gurus use to write the many books for world cruising. They didn't invent this stuff by going every place. It's like Las Vegas the percentages win but you can always lose.

There is still risk. Add sat phones and instant weather data to cut the odds. Modern data and technology allows you to boost the odds. Magellan had expendable crew. Not an option these days (probably a good thing).

With a poor compass and a solid plan you could go most places if you knew all the basics. You can always get stuffed by a freak storm.
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Old 20-07-2011, 22:50   #111
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Re: Magnetic North Shift

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Global climate change is a direct response to massive fossil fuel burning (by humans), in the last 150 years. There are far too many of us, and we make a disproportionate impact due to both our technologies and our numbers. This is not just "an opinion", it is the result of decades of research by the world's leading scientist in the field. Of these accredited & published scientist, not counting the ones working for BP or EXXON, there is a 99.9% consensus. There really is no "world wide" disagreement about this point. Only one country, the US, has a large number of disbelievers, and they got their "facts" from talk radio, or other equally biased sources. They choose to bury their heads in the sand, rather than be part of the solution. For the most part, it is not "climate change" that they don't believe in, it is SCIENCE itself. Anyone who believes in and knows how to study the unbiased studies on the subject, would see that the evidence is overwhelming... Almost up there with the evidence for gravity. You could claim that it's not "proven" either.

We all have to live with our conscience, and mine doesn't allow me to bury my head in the sand. I don't really think that my living my beliefs, for what time I have left, will make a difference. It is only a symbolic gesture. (Such a small percentage of the Earth doing this, is "too little, Too late". I suppose that my "tilting at windmills" is better than just waiting to die, and "to hell with future generations". THEY are the ones that will have to live with the choices that we make right now.

There are so many little ways we can make things better, if we try. This fish kill, is from nutrient runoff in the river, leading to algae blooms, cutting off the oxygen supply in the water, killing the fish for months. (Tens of millions, in one event). The nutrient runoff is from factory hog farms spreading their waste in fields, that drain into streams / the river, etc. It is also from fertilizing fields that drain like above, in agriculture, as well as lawns and golf courses.

My conscious choice not to procreate, trying to avoid food from "factory farming & factory ship fishing", buying "green" products from "green" sources, recycling, having a mulched yard rather than grass, planting trees rather than cut them down, driving as energy efficient a car as I can afford, insulating, going all solar on our boat, going "sail" rather than "power", never touching the coral, etc, etc, etc... It all is just a symbolic "feel good" waste of time. I know that, but if we ALL did it we just "might" minimize the climate changes a bit, or slow them down to a pace that we can adapt too.

Mark
Mark,
I had to say this, with all the scientist that say Global warming is real and what you have said, can you answer this? What is the normal average temperature of the earth?
My answer is- No one knows so, how can anyone say it warming or cooling? Iceages, warming times.. What temp do you pick to go off? maybe 80 degrees is average for the earth and its just going back to normal.. in the 70s global cooling No one knows or can say truthfully.
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Old 21-07-2011, 00:25   #112
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Re: Magnetic North Shift

I think the alleged global warming is part of a cycle. Granted we humans have speeded the process up a tad. But glaciers' were once in New York state as well as California and the level of the ocean was 300 feet shallower, and it didn't start 150 years ago.
We have many more urgent things to correct than something that may occur in a million years.
Events of the next week are going to determine if you have enough capital to go cruising.
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Old 21-07-2011, 01:28   #113
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Re: Magnetic North Shift

So many climate science experts! On a sailing forum! Who would have thunk it?
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Old 21-07-2011, 07:16   #114
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Re: Magnetic North Shift

You must have missed the very long and long winded CF thread on plankton in the oceans.
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