As most of us know when setting up the anemometer we have to set the direction facing NORTH because I live in the northern hemisphere.
Having a compass on my iPhone there are 2 options.
1. Apply............ Magnetic north
2. Normal mode... North
Which of the 2 options is correct ?
Thanks Tony
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Whats the right setup for the anemometer ?
- PaulMy
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Re: Whats the right setup for the anemometer ?
I don't have any official reference but have read somewhere that it should be true north - and that would likely be your 2. Normal mode... North. Makes sense as magnetic is not a fixed/stationery location.
Paul
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- steve
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Re: Whats the right setup for the anemometer ?
Yes, wind direction should be reported relative to true north.
Steve
- GraemeT
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Re: Whats the right setup for the anemometer ?
...and just to throw in a bit of confusion, you should take into account 'angle of declination'.
This link describes how it works: http://maps.ngdc.noaa.gov/viewers/histo ... clination/
Although as far as I can see, as amateur weather station operators we really don't need such critical accuracy.
It might be different if we were sailing around the world on a square-rigger - it could make all the difference between finding land or dying of thirst and starving...
Cheers,
This link describes how it works: http://maps.ngdc.noaa.gov/viewers/histo ... clination/
Although as far as I can see, as amateur weather station operators we really don't need such critical accuracy.
It might be different if we were sailing around the world on a square-rigger - it could make all the difference between finding land or dying of thirst and starving...
Cheers,
Cheers,
Graeme.
Graeme.
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Re: Whats the right setup for the anemometer ?
Applying the angle of (d)eclination to magnetic north gets you true northGraemeT wrote:...and just to throw in a bit of confusion, you should take into account 'angle of declination'.
This link describes how it works: http://maps.ngdc.noaa.gov/viewers/histo ... clination/
Although as far as I can see, as amateur weather station operators we really don't need such critical accuracy.
It might be different if we were sailing around the world on a square-rigger - it could make all the difference between finding land or dying of thirst and starving...
Cheers,