Altitude incorrect while hiking

[freeheeler]

@Sergei-Ladeishchikov
please observe your next hike if it happens again.
normally FusedAlti detects when the altitude is wrong and corrects it.
I’ve had a similar issue on a 1h run recently, when the watch showed 60m below actual altitude throughout the entire activity. once only, didn’t happen again.
please let us know in case you observe it again

[Sergei Ladeishchikov]

I also noticed that for 10 hours of activity with an external heart rate sensor and without using S+, the watch took about 20-22% of the charge.

[freeheeler]

@Sergei-Ladeishchikov
that’s roughly 2%/h and ok-ish with external HR, IMO.
internal OHR is more efficient than external.

[Sergei Ladeishchikov]

@freeheeler I also noticed that the total climb is the same as the route. Could it be that FusedAlti did not work in custom battery mode?

[Sergei Ladeishchikov]

@freeheeler Is 2% a lot? I always do activities with an external heart rate sensor (Polar H10).

[freeheeler]

@Sergei-Ladeishchikov
did you use maps, too?
2% is about to expect with external HR, but in case of maps being in use definitely it is realistic.

hmm, I am not aware of any setting that would deactivate FusedAlti. but for example a trail covered with trees could make it difficult for FusedAlti to measure correctly.

[Sergei Ladeishchikov]

@freeheeler I did not use the map so often, I already knew where to go. At the beginning of the hike there were quite a lot of trees. So, if FusedAlti couldn’t make an altitude adjustment in the first 15 minutes, then he doesn’t do it anymore?

[Sergei Ladeishchikov]

@freeheeler Thick trees started from the 7th minute of the hike.

[freeheeler]

@Sergei-Ladeishchikov
normally it does the correction within 15min, but as I understand should check throughout the activity if something changes again, e.g. pressure drop due to bad weather

[Sergei Ladeishchikov]

@freeheeler Should I or the SV check altitude throughout the activity? Doesn’t SV know GPS altitude, especially in dual-band GPS/GNSS?

[Mitch9]

For me the height accuracy of the SV is really great in the mountains. Mostly within 10 m for peaks which is amazing for such a device. Sometimes I calibrate the height (when the situation is right for it) but not always.

[babychai]

the accuracy sometimes depend on the location. some mountains my SV show higher and some mountains show lower altitude at the peak. so far within 20 meter range.
maybe the altitude shown on signboard at the peak doesn’t accurate as well. you can double check on the TOPO map.

[gone troppo]

My sv altitude is always very close on 1000+m mountains usually within 10m. I don’t calibrate it or anything before starting I just let it run

[Łukasz Szmigiel]

@Sergei-Ladeishchikov did you manually set elevation prior to the hike?

[freeheeler]

@Łukasz-Szmigiel
that’s not necessary but doesn’t effect either

[Łukasz Szmigiel]

@freeheeler I’ve read somewhere around the forum that if you set elevation manually prior to the workout it can disable fused alti for some time.

[freeheeler]

@Łukasz-Szmigiel
yes that was true until a date we can not tell anymore because it’s unknown
I did a test recently and it was confirmed by others. you can do what you want and when you want with manual calibration, FusedAlti will correct it anyway if necessary

[Łukasz Szmigiel]

@freeheeler cool, didn’t know about it, thanks.

[Sergei Ladeishchikov]

@Łukasz-Szmigiel I did not set the height, the FusedAlti had to set it.

[Sergei Ladeishchikov]

@babychai All the maps show the same height - 3450 m. Either my FusedAlti was blocked at the beginning of the trip, it was blocked due to and did not work during the trip, or FusedAlti did not work at all. 1/3 of the trip was forest, the rest mountains with open space.