Firmware Rollback - Firmware with best GPS

[Mff73]

@mrony said in Firmware Rollback - Firmware with best GPS:

@surfboomerang Hello, I also have the topic of GPS measurement (Baro 9) in the vertical segment! Sunny weather, on different days and different time (same tour and new tours), deviations never less than 9m! on my last 15 tours there were about 2 peaks where I was at 3m deviation! I am not satisfied with these values! BG

does the watch records always the same altitude for the same peaks ? and are you sure of those peaks real altitude ?
also consider that altitude is a matter of reference
Not to say you are wrong, but to more understand. And with no data to look at, it is difficult to debate.

[surfboomerang]

@MRony Like @Mff73 said.
Some examples would be helpful then.

[MRony]

@surfboomerang

[Mff73]

@mrony
do you have already tried to clean your baro sensor ?
have you tried the fridge test ? https://forum.suunto.com/topic/3519/alti-baro-fridge-test

[surfboomerang]

@mrony
Try the suggestions of @Mff73.

To be honest, I think the numbers you see are well within the margin.
I mean elevation lines on maps aren’t 100% accurate as well as I learned the hard way: https://forum.suunto.com/topic/5234/route-altitude-bug?_=1613401264400

Even the same map provider isn’t consistent

Furthermore a 2-3m difference can almost be achieved by putting the watch on the ground or waving your arm in the air. So unless you have your watch on the exact same spot from the official measurement it’s really hard to compare.

[MRony]

@surfboomerang hello, peaks usually have the correct elevation on the maps. the app “peakhunter” confirms this. a deviation of about 3m would be ok, but I can’t understand that this is not possible on a single tour!

[Brad_Olwin]

@mrony said in Firmware Rollback - Firmware with best GPS:

@surfboomerang hello, peaks usually have the correct elevation on the maps. the app “peakhunter” confirms this. a deviation of about 3m would be ok, but I can’t understand that this is not possible on a single tour!

This is possible because the watch is assessing elevation using a barometer that is pressure sensitive and attempting to correct this with a GPS measurement. Our estimates of peak heights are simply not exact. For example, Colorado, USA just revised its estimates of peak elevations with a new reference standard and we are going to have one less 4267m (14,000 foot) peak. So the accuracy you are seeking is not in the reference data you are referring to as @surfboomerang eloquently stated.
Second, changes in barometric pressure will affect the elevation even with GPS correction, this can easily occur. Third, depending on where the watch is placed and how you are moving, this will affect elevation measurements and there are algorithms built in to deal with this. The watch is not a precision elevation measurement instrument.

IMHO there is nothing wrong with your watch or the elevation values you are getting.

[A Former User]

@brad_olwin the only who can show error is this one

[Brad_Olwin]

@g287-sf That one is further off, I agree but the GPS point may or may not be at the true summit, the map could be off or I have had occasional elevation readings that are off. Typically, this is due to rapid changes in weather. More often, my watch is very close (within 3-6m), which I think is fantastic.

[A Former User]

@brad_olwin honestly for me 10meters in X and Y is normal.