Firmware Rollback - Firmware with best GPS

[surfboomerang]

@g287-sf said in Firmware Rollback - Firmware with best GPS:

@brad_olwin My 2 GPS tracks looks similar. It was just altitude who was bad.
For me 10 meters difference for GPS is acceptable when we know gps precision is around 3.3 meters. More is limit for outdoor device because it can cause orientation error.

Keep in mind that the GPS precision most people talk about is the horizontal precision. Vertical is usually much less precise. That is where the barometer comes to the rescue.
To be honest, if calibrated correctly, the Suunto 9 baro is pretty accurate in altitude to me.

[freeheeler]

@g287-sf
I have set my watch to GPS+QZSS after playing a bit with the other systems, too. I left it as mentioned and never touched it or thought about it. Some days it’s better, some days it’s worse. But always in regards to the track itself. I think altitude shouldn’t be an issue as you’ve got the baro, right?

@Brad_Olwin
you’re right, the true comparison is only possible with your cyborg tests like you do with many watches on one arm
but I think users get a general feeling if their devices are more precise, react quicker etc… it is more of an impression thing I guess.

[Brad_Olwin]

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

@g287-sf
I have set my watch to GPS+QZSS after playing a bit with the other systems, too. I left it as mentioned and never touched it or thought about it. Some days it’s better, some days it’s worse. But always in regards to the track itself. I think altitude shouldn’t be an issue as you’ve got the baro, right?

@Brad_Olwin
you’re right, the true comparison is only possible with your cyborg tests like you do with many watches on one arm
but I think users get a general feeling if their devices are more precise, react quicker etc… it is more of an impression thing I guess.

It is even worse than that! I have a wheel and a measured route to test how precise the GPS is. I always run/walk on the path the wheel was used and I have multiple wheel measurements to get a reliable distance. I have no idea what the neighbors think when they see me walking with a a wheel to measure distance:)

[A Former User]

@brad_olwin if you speak French you should follow “Montre Cardio GPS” on YouTube or even is blog. I run with many watch at the same time do plenty test. You should like it.

[stromdiddily]

@brad_olwin can’t be any worse than what they think watching you run with 7 different watches on

[freeheeler]

@brad_olwin
too old for a stroller, too young for a rollator

[MRony]

@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

[DMytro]

@mrony it’s not gps but barometer that gives you this values. Difference of 3m is totally tollerable for s9b if I know correctly.

[MRony]

@дима-мельниченко +|-3m ok, but Not +9m and More at every Tour!

[DMytro]

@mrony I would say it’s ok as well. But I have a non baro version, so others could validate your conserns better. For me same peak may be +/- 20m ( and it’s still ok in my opinion).

[zhang965]

For me the last firmware is not getting better.

[surfboomerang]

@mrony do you have the Baro version of a watch?
Also I noticed sunny weather is not a guarantee for good GPS reception.

[MRony]

@surfboomerang s9 baro

[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.