Wind Vane Reads True Wind or Apparent Wind

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Old 01-24-2022, 02:42 PM #1

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Standalone wx station?


ooking for recommendations for a decent wx station that works without internet (away from the dock). I adopt one that operates on bluish tooth or similar - I just finished running the wiring for a 4 camera arrangement and really don't want to accept to do that once more... Ideally a 12v brandish with a remote mounted air current/temp/humidity, etc sensor that transmits to the brandish wirelessly.. Recommendations

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Old 01-26-2022, 10:xxx AM #2

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I have one by Ambient Weather on our gunkhole and have been happy with it. Mine will connect to wifi if you want to monitor it remotely but you can use the included display to view data while on the boat. The display is 120V only I run ours off a small inverter similar you would utilize in your automobile. If you telephone call them and explain that this is for a gunkhole they will guide you lot through what options you want. They have bang-up customer service.

I take no affiliation with them, merely a happy customer.

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Old 01-26-2022, ten:41 AM #three

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I as well am looking for a weather station that will give me current of air speed with TRUE wind direction while underway. Without spending thousands. I will check with Ambient

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Old 01-26-2022, 10:42 AM #iv

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I have a davis vantage vue weather station.

Works wonderfully.

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Old 01-26-2022, 12:25 PM #5

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I more thing about the ambience stations. They are not designed for mobile applications and don�t know which direction the boat is facing. I have mine oriented so that northward is the bow of the gunkhole. When it shows a wind direction from the north it is actually telling me that the wind is coming from the bow(regardless of which direction the boat is facing).

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Old 01-26-2022, 04:58 PM #half-dozen

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I besides am looking for a weather condition station that will give me current of air speed with TRUE wind direction while underway. Without spending thousands. I will cheque with Ambient

Many modern mfds will give true wind using data from simple credible current of air sensors. My Garmin has a pretty good set up of tools and displays that I employ on my sailboat, using AWA and AWS from the NMEA 2000 network.

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Old 01-26-2022, 07:nineteen PM #7

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I too am looking for a weather station that volition requite me wind speed with TRUE current of air direction while underway. Without spending thousands. I will check with Ambience

Is that possible ? Doesn't the motion of the boat make a true measurement impossible ? ie, if you are headed due north at 8 knots and the wind is from the east at 8 knots, won't your wind indicator say 5.7 knots from 45 degrees ?

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Old 01-26-2022, 08:51 PM #8

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Is that possible ? Doesn't the motion of the boat make a true measurement incommunicable ? ie, if you are headed north at viii knots and the wind is from the e at 8 knots, won't your wind indicator say five.vii knots from 45 degrees ?

They have instruments for sailboats that practice this.

They can read out in wither apparent or true mode.

My little Davis weather station reads out in apparent mode simply and it does not taker a heading sensor input so information technology thinks the bow of the boat is due south considering that'south the direction of my slip right now.

Information technology reads out while on the gunkhole, and remotly.

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Old 01-26-2022, 09:43 PM #9

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Is that possible ? Doesn't the motion of the boat make a true measurement impossible ? ie, if you lot are headed due north at viii knots and the wind is from the e at eight knots, won't your wind indicator say 5.7 knots from 45 degrees ?

Nope. 11.3 knots from 45� off the starboard bow, assuming the air current vane is oriented with N facing the bow..

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Old 01-27-2022, 04:23 AM #10

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Nope. 11.three knots from 45� off the starboard bow, assuming the wind vane is oriented with North facing the bow..

You're right.....I rushed the math.....I was really more concerned with the direction than the speed but cheers for catching it. -Greg

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Old 01-27-2022, 06:xviii AM #xi

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Most fly instruments used on sailboats will give you true wind direction and speed and also apparent air current and speed. Apparent factors in the boats course and speed. I dont care nigh credible wind speed. Just the direction.

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Old 01-27-2022, 06:32 AM #12

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Kindredspirits setup volition allow for truthful direction if you add together or decrease the air current direction in degrees from the boats heading in degrees……… Me thinks.

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Old 01-27-2022, 07:ten AM #xiii

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For those with fairly modern MFD systems, why non add an Airmar conditions sensor (equally Jeff F points out upthread) ? Has an integral GPS and can summate apparent and true wind? N2K plug and play. The simply matter it doesn't do is rain gauge. Aye, more than a few hundred bucks (around $1k), but an elegant solution.

https://www.airmar.com/sensing-weath...EaAmlHEALw_wcB

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Old 01-27-2022, 07:17 AM #14

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Originally Posted by Cigatoo View Post

Kindredspirits setup will allow for true direction if you add or subtract the current of air direction in degrees from the boats heading in degrees��� Me thinks.

I had an early version of the Davis total wx station aboard. In theory, yous can exercise the math. In practise, heading is e'er changing and then math goes from uncomplicated add/subtract to differential equation calculus. These systems are designed for terrestrial applications where they are calibrated to N and do not move. Nigh useful in your dwelling house berth.

If you want a wind gauge to detect gust strength and direction (useful for docking in a airplane pilot house), you really demand the Airmar sensor I linked in previous post.

Peter

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Old 01-27-2022, 07:25 AM #15

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Overall, never had much longevity out of the inexpensive ones on the boat and the final several wireless ones seem to quit working in college winds when I actually wanted them.

Non sure how accurate true wind (direction and speed) tin can ever be on a moving, pitching rolling, boat.

You can guess at the average merely it does constantly fluctuate or if delayed is still just and average of all the motions.
I never worried about it...fifty-fifty less on power than sail.

Just poking my head out and looking at my heading/speed can guess good enough. Well.... non on 20+ know boats but my trawler no problem.

Have the the graphic Starpath wind calculator on my older computer. It calculates that with a couple simple entries. It's good for calculating a lot of trig issues.

Here is the modern 1 with no graphic.

https://www.starpath.com/calc/Weathe...tors/wind.html

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Old 01-27-2022, 09:41 AM #16

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In all seriousness, a weather condition station that shows current weather on a powerboat, while nice, is not as of import as it is on a sailboat. A 20 or 30 degree wind shift or ten knot change in velocity doesn't really alter your plans much while underway. I guess it could be helpful in an anchoring state of affairs, though it's pretty like shooting fish in a barrel to tell wind management close enough for anchoring.

I'd still similar a weather station though, but proverb that aren't all that important. Not like an accurate forecast.

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Old 01-27-2022, 10:10 AM #17

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Originally Posted by mvweebles View Post

For those with fairly modern MFD systems, why not add an Airmar weather sensor (as Jeff F points out upthread) ? Has an integral GPS and can calculate apparent and truthful wind? N2K plug and play. The just thing information technology doesn't do is pelting gauge. Yes, more than a few hundred bucks (effectually $1k), but an elegant solution.

https://world wide web.airmar.com/sensing-weath...EaAmlHEALw_wcB

Peter

I was really trying to point out that true current of air can exist calculated by the MFD, using a less expensive sensor. No need for a GPS enabled sensor, assuming the MFD has this feature.

This one would work, for example, at under $500. Or the less expensive Airmar unit that provides apparent only.
https://world wide web.defender.com/product.jsp...831&id=6867869

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Old 01-27-2022, 12:37 PM #18

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I too am looking for a weather station that will give me current of air speed with TRUE wind direction while underway. Without spending thousands. I will check with Ambience

If you want true direction (and/or true speed) while under way, since the car can only measure apparent direction (and speed), it volition demand the gunkhole's actual speed and direction to deduce true speed and direction. Many MFDs exercise this adding, of provided the necessary data.

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Old 01-27-2022, 12:52 PM #19

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Credible wind is easier to calculate on a powerboat than a sailboat. Trivial heel, not much elbowroom, no sails to mess up credible or true wind sensed at the height of the mast.

I'd bet in that location's an app that can instantly summate true wind based on known apparent air current and boat velocity. So a dwelling unit of measurement could be used as an inexpensive substitute.

Cheque out Tempest weather instruments.

https://weatherflow.com/tempest-weather-arrangement/

I accept one at home and love it.

Also great for checking out local conditions with the shared systems on the map.

https://tempestwx.com/map/62.7402/-113.0051/3

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Old 01-27-2022, 01:05 PM #20

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Originally Posted by Northern Spy View Post

Apparent wind is easier to calculate on a powerboat than a sailboat. Lilliputian heel, non much leeway, no sails to mess upwardly credible or true wind sensed at the pinnacle of the mast.

I'd bet there'south an app that tin can instantly calculate truthful wind based on known apparent wind and boat velocity. And then a home unit could be used every bit an cheap substitute.

Bank check out Tempest weather instruments.

https://weatherflow.com/tempest-atmospheric condition-system/

I take one at home and beloved information technology.

Also great for checking out local atmospheric condition with the shared systems on the map.

https://tempestwx.com/map/62.7402/-113.0051/3

Interesting, there are two boats in my marina with this system:

https://tempestwx.com/map/39175/27.794/-97.3857/15

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Wind Vane Reads True Wind or Apparent Wind

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