Kestrel question.- Correct altitude ?

[Down Under Hunter]

I recently have been only using the BP , RH and temp for the NF exbal program. I also wish to enter alt but dont know how to set the right refence so I get the numbers I need. If I remember correctly it refences a BP figure.

I use raw station pressure for my BP numbers. So I enter "0" in the refence screen currently and I'm told this is correct. Just want a accurate alt to enter in Exbal.

Thanks once again fellas !

DUH

[Eaglet]

Originally Posted by Down Under Hunter

I recently have been only using the BP , RH and temp for the NF exbal program. I also wish to enter alt but dont know how to set the right refence so I get the numbers I need. If I remember correctly it refences a BP figure.

I use raw station pressure for my BP numbers. So I enter "0" in the refence screen currently and I'm told this is correct. Just want a accurate alt to enter in Exbal.

Thanks once again fellas !

DUH

DUH, you might want to read these posts, starting on the third post down. Let me know what you think.

[Down Under Hunter]

Eaglet.

Thanks for the tip.

I agree with your theorys completely.

When I saved sight in conditions I entered zero in the alt box. ( I will need to change that )

I have unchecked the the top box in the sight in conds page. ( I think that is what I need to do )


Now that I know I need the alt figure I will enter the raw stn pressure figure I had that day as the refence and enter in the alt box the number the kestrel gives me for alt.

To get the correct alt figure on the kestrel it asks for a refence figure BP- alt, alt - BP I think.

I still am confused a little. DO you mean that I get the raw stn BP, then go to the alt function and re enter the raw stn pressure figure as the refence ? This will then give me a alt figure based off the raw stn pressure ? Correct ?

Many thanks

DUH

[Eaglet]

Originally Posted by Down Under Hunter

Eaglet.

Thanks for the tip.

I agree with your theorys completely.

When I saved sight in conditions I entered zero in the alt box. ( I will need to change that )
[QUOTE]Yes, you need to enter the on location elevation or altitude.[/QUOTE]

I have unchecked the the top box in the sight in conds page. ( I think that is what I need to do )
[QUOTE]If it is unchecked it will save your sight in conditions and when you move to different conditions and you enter them, these new set of conditions will not replace the saved sight in conditons. The program will be giving you accurate information for your new location.[/QUOTE]


Now that I know I need the alt figure I will enter the raw stn pressure figure I had that day as the refence and enter in the alt box the number the kestrel gives me for alt.

To get the correct alt figure on the kestrel it asks for a refence figure BP- alt, alt - BP I think.
[QUOTE]I have two weather stations and none is a Kestrel. You'll have to make sure you're using it right. Time to read the instructions my friend.[/QUOTE]

I still am confused a little. DO you mean that I get the raw stn BP, then go to the alt function and re enter the raw stn pressure figure as the refence ? This will then give me a alt figure based off the raw stn pressure ? Correct ?
[QUOTE]You got me here, are you talking about Kestrel? You have to configure Ketrel in a way that when to enter the BP screen it will give you the On Location reading. I think you accomplish that by making sure the in the BP screen the internal Altitude is set to 0 (zero) and by moving to a Known altitude, in the altitude screen you set that known altitude. This process of re-entering known altitude in the altitude screen of kestrel is done frecuently depending on how frecuent the weather conditons are changing.[/QUOTE]

Many thanks

DUH

I hope this helps. If not, you can always PM or e-mail me.

[WWB]

When using the Kestrel Units to obtain the "Station" Barometric Pressure, the reference altitude must be set at 0 Feet. This will give you the "Station Pressure," which is what you want.

To obtain altitude, you must set the BP reference to a known altitude for the current weather system. This is good for mountain climbers, as they may need to know what elevation they are at, although for Shooters utilizing Night Force Ballistic Targeting software, it is theoretically irrelevant.

HOWEVER, you can use a combination of the altitude and the BP to obtain an even greater percentage (although very small) of accuracy. This is how it is done;

1. Obtain an altitude reading from your GPS and enter it into the data entry point in your NF software.

2. Make certain that you check the "Use Standard Pressure" pick-box

3. Pick the "Calculate" button.

4. Re-Run the calculation again, but first uncheck the "Use Standard Pressure" pick box and enter your current BP "Station Pressure."

5. Pick the calculate button again.

[Down Under Hunter]

Thanks boys for your assistance.

Thaks eaglet for your help mate. To be honest I am still confused though.

Sitting at my PC now I can get a altitude and BP reading from our local airport. I know that the airport is 163 feet above sea level and the BP currently is 1028.1 hpa. CAn I use this data for input.

It seems that with the kestrel that BP reference in the alt screen has a direct affect on the raw stn pressure on the BP screen.

Thanks again all !

DUH

[Eaglet]

Don't give up, friend, just re-read what you have and it will became clear. Best I remember, it just did not come to me, I went back and forth untill it made sence. Don't give up! You can do it!