Auto adjust altitude

khooteng

Hi,

Is there a guideline on how often should we perform auto adjusting the altitude on Suunto 9 Baro? It goes haywire or become incorrect after sometime.

Also, before starting an activity/exercise, will the watch auto adjust altitude after getting GPS signal? or should I manually auto adjust it before activity?

Thanks for any insight.

Regards,
Teng Hin

Suunto 9 Baro v2.9.42
Suunto App Android v4.12.6

RuudK

It looks like this is the same with the SSU. Sometimes there is a big difference with the altitude when I’m on the same location with the day before.

freeheeler

@RuudK
the watch switches between alti-baro automatically. when you’re moving the watch goes alti and should change the altitude. when the weather changes and you’re static in one location the watch goes baro and keeps the alti. sometimes both happens at the same time or the watch does not recognize that you’re moving eg when you’re driving in the car without significant motion… then the alti values are incorrect.
how often you should auto update it is up to you. I normally update manually at home where I know my altitude for sure but only when I see that it is far off.

You can always start an activity with way off alti values. FusedAlti corrects the alti backwards after couple of minutes (I think around 10minutes or something).
If the difference between alti and gps measuring is going too far apart it will correct again afaik. But if this goes backwards to start point, I’m not sure and I don’t hope/think so.

…anyone please correct me if I’m wrong

Mff73

In the new Spartan FW released in 2047, we had this feature, why not implement it again ?

Mff73

Sorry, fusedalti is so nice feature, but if we trust it, we may be wrong, and angry when in front of path panel, with wrong altitude

freeheeler

@Mff73
but fusedalti will correct if we are on a 12h or longer tour and when going into another valley with different pressure and weather it will correct it. That’s why I like it… but a notification would be great!

nseslija

https://www.suunto.com/Support/faq-articles/lifecycle/what-is-the-difference-between-a-gps-watch-and-a-gps-watch-with-barometer/

I personally adjust attitude manually almost every day… FuseAlti can help, but for me manually adjusting is more reliable

Mff73

@nseslija said in Auto adjust altitude:

https://www.suunto.com/Support/faq-articles/lifecycle/what-is-the-difference-between-a-gps-watch-and-a-gps-watch-with-barometer/

I personally adjust attitude manually almost every day… FuseAlti can help, but for me manually adjusting is more reliable

i would like this option and process :
on activity launch, watch to propose the current GPS altitude known, whatever if watch decides it is not precise enough. And let me decide if i let it use this altitude to initial calibration, or not.

So many time, fused alti don’t change altitude where i live, and for any place where start altitude is not know, a raw initial GPS altitude would be nice to be set.

then let the fusedalti algorythm work, but if it fails, first calibration is still done “roughly” but better than too many meters off.

freeheeler

@nseslija
it’s because you know exactly what you are doing but you don’t know exactly what the watch is doing

freeheeler

@Mff73 said in Auto adjust altitude:

on activity launch, watch to propose the current GPS altitude known, whatever if watch decides it is not precise enough. And let me decide if i let it use this altitude to initial calibration, or not.

good suggestion!

nseslija

Yes, I tried couple of times auto adjustment on known attitude and it didn’t go that well…

bbx100

@TELE-HO Good idea, but only problem is when altitude is start drifting again in next walley with different pressure than before than fuesed alti will again need to ask wather to use gps or manual altitude. My fused alti on SSS Baro is not 100% correct so even if I enter correct altitude it overwrites my altitude with not so correct one.

bbx100

@nseslija I have a question. Why changing reference altitude creates spike in air pressure graph, although weather trend didn’t change. It confuses me because if I enter slightly different ref altitude than it is in the watch because it drifted, than it creates spike in baro graph and confuses weather trend. My old core didn’t do that. On entering ref altitude it only changed sea level pressure number, but did not alter the graph? So now if I regulary enter ref. altitude it always creates spike in baro graph and alters it

Brad_Olwin

@khooteng I rarely adjust my altitude. FusedAlti works well for me but I typically have exercises with 300m gain/loss on weekdays and more on the weekends. I think with small hills it is typically more of a problem.

nseslija

@bbx100 As far as I know, absolute air pressure is measured constantly but not displayed on the watch, Sea level air pressure is what you see on the watch…

khooteng

@Brad_Olwin and to the rest of the community, Thanks for your inputs.

Looks like I just have to hope and trust that the watch is able to self correct.
BTW how can we tell if the watch had already self-adjusted it’s altitude? TIA!