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 Post subject: Altimeter reset
PostPosted: Wed Jan 20, 2016 10:19 am 
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Joined: Fri Nov 20, 2015 2:35 am
Posts: 260
Location: Poole Dorset
My altimeter shows 150ft constantly.
Anybody know how to reset/recalibrate it please?

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 Post subject: Re: Altimeter reset
PostPosted: Wed Jan 20, 2016 10:24 am 
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Joined: Fri Jul 18, 2014 4:46 am
Posts: 2789
I don't think you can. It is actually a barometer and infers altitude based on average sea level atmospheric pressure. Even if you could reset it, you would be having to do so every day to compensate for changing pressure.


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 Post subject: Re: Altimeter reset
PostPosted: Wed Jan 20, 2016 10:39 am 
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Joined: Fri Oct 30, 2015 10:49 am
Posts: 96
I assumed it was inferred from satellite positions

I don't see how a barometer could infer height giving the variance within the day based on changing weather conditions


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 Post subject: Re: Altimeter reset
PostPosted: Wed Jan 20, 2016 10:40 am 
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Joined: Fri Nov 20, 2015 2:35 am
Posts: 260
Location: Poole Dorset
On the Gx4h there is an altimeter.
But I do admit I am not aware how it works. I also assumed it calculated it from the GPS. as my Garmin does.
( I am thinking of gluing my Garmin onto the screen it would be easier o use than the built in nonsense !!! ;) )
However it works, it should not be stuck at 150ft (and never alters) when I live 27ft above sea level. My girl friend lives 369 ft above sea level in North Dorset but my car still says 150ft!
Poole Mitsu have not come across this problem.

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 Post subject: Re: Altimeter reset
PostPosted: Wed Jan 20, 2016 10:51 am 
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Joined: Fri Jul 18, 2014 4:46 am
Posts: 2789
Carnut wrote:
On the Gx4h there is an altimeter.
But I do admit I am not aware how it works. I also assumed it calculated it from the GPS. as my Garmin does.
( I am thinking of gluing my Garmin onto the screen it would be easier o use than the built in nonsense !!! ;) )
However it works, it should not be stuck at 150ft (and never alters) when I live 27ft above sea level. My girl friend lives 369 ft above sea level in North Dorset but my car still says 150ft!
Poole Mitsu have not come across this problem.


In that case it does sound as if it is broken - but I think it would be a case of replacing the sensor.


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 Post subject: Re: Altimeter reset
PostPosted: Wed Jan 20, 2016 10:56 am 
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Joined: Fri Jul 18, 2014 4:46 am
Posts: 2789
raymie wrote:
I assumed it was inferred from satellite positions

I don't see how a barometer could infer height giving the variance within the day based on changing weather conditions


No - definitely barometric - this has been discussed before. GPS altitude is pretty inaccurate too - far more so than position in the X-Y plane. Aircraft will not use it as their primary source of altitude information because it is too difficult to correct - the DSC radio on our boat has a display of GPS derived altitude - silly really since it will by definition be sea level plus or minus a metre or two - and I've watched it swing between zero and something in the region of 50 metres over a few tens of seconds.


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 Post subject: Re: Altimeter reset
PostPosted: Wed Jan 20, 2016 11:12 am 
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Joined: Fri Oct 30, 2015 10:49 am
Posts: 96
I'll need to see what mine says tomorrow re height but if it does use a barometer then it will be very out, even today, a very mild stable day the range here has changed by 20 mbar (999 - 1018) according to my weather station (a wmr300)


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 Post subject: Re: Altimeter reset
PostPosted: Wed Jan 20, 2016 11:16 am 
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Joined: Fri Oct 30, 2015 10:49 am
Posts: 96
so far all the posts I see mention it working by GPS such as http://mitsubishiforum.com/forum/mitsub ... sor-29602/

not a reliable guide however perhaps to reality


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 Post subject: Re: Altimeter reset
PostPosted: Wed Jan 20, 2016 11:31 am 
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Joined: Fri Jul 18, 2014 4:46 am
Posts: 2789
raymie wrote:
so far all the posts I see mention it working by GPS such as http://mitsubishiforum.com/forum/mitsub ... sor-29602/

not a reliable guide however perhaps to reality


I am talking about the 2014 model - perhaps it has changed for the latest version. Mine actually displays both altitude and atmospheric pressure. But GPS altitude is little more accurate than uncorrected barometric altitude - and it cannot be corrected.


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 Post subject: Re: Altimeter reset
PostPosted: Wed Jan 20, 2016 12:37 pm 
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Joined: Mon Dec 16, 2013 1:18 pm
Posts: 3222
Location: Netherlands
Carnut wrote:
On the Gx4h there is an altimeter.
But I do admit I am not aware how it works. I also assumed it calculated it from the GPS. as my Garmin does.
( I am thinking of gluing my Garmin onto the screen it would be easier o use than the built in nonsense !!! ;) )
However it works, it should not be stuck at 150ft (and never alters) when I live 27ft above sea level. My girl friend lives 369 ft above sea level in North Dorset but my car still says 150ft!
Poole Mitsu have not come across this problem.

Mine does the same - it consistently insists the car is flying at an altitude of 50 m. whilst in fact it is driving below sea level.

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