Total Ascent Values Exaggerated by 50% [Bug 29]

[RickN55]

How come? Comments are still related to the bug..

[RickN55]

Any how spoke to Garmin again earlier, and after sending them my connect routes from both devices on the same walk at the same time showing a massive 700feet difference in ascent and descent apparently there's no issue and it looks perfectly normal for them to both read different values, which sure I agree they're never going to read the exact same but to be that far out everytime compared to TWO other Garmin devices (Epix and 65s) there's an issue somewhere!

So don't hold your breath on this issue being sorted anytime soon if at all...

[JungleJim]

Back on topic, I analyzed all the activities I have recorded on my 67 and I compared the total ascent and descent recorded by the device, the ascent/descent as reported by Garmin Connect with elevation corrections applied (based on map data) and the ascent/descent as calculated by Basecamp from the waypoints (so without the summary data recorded by the GPSMAP).

Conclusion: all software versions I had on my device (4.70, 4.80, 5.30 and 6.60) suffer from inconsistent ascent/descent values as recorded by the GPSMAP compared to DEM data and recorded elevations. Sometimes the summary total ascent/descent matches pretty closely with Basecamp calculated values. At other times there's a difference between 30% and 50%.

So based on my data the behavior hasn't changed between firmware versions. And also I could not really determine what circumstances influence these differences. So that makes it a bit difficult to report it to Garmin if it is not reproducible...

[Domi93CH]

interesting, I have the feeling that it is much worse with the 6.60. Since I'm riding the same route again at the weekend, where I only have 6.60 (450m descent and 1050m ascent) on this route there is actually only (50m descent and around 600m ascent).

I've now got the 4.80 back and now have very good results:

The route was an approximately 1.3km long gently sloping mountain road.
Only on the climb does the Gpsmap 67 have 20m and the topo map only 2m, but the descent is very accurate.

Although I find that the Garmin map data is not always very accurate, I have already seen differences on the same route with Basecamp and the Topo Switzerland app

[Domi93CH]

If you use bridges, tunnels or something similar on the route (where you are not on the ground) you will ruin the altitude with the Basecamp altitude data (at least on my TopoSchweiz) but if I measure the same route on TopoSchweiz I get the correct values. The map data is probably partially compressed in order to be able to be used by the GPSmap. This seems to me to have quite extreme differences in some places compared to the map query on the Toposchweiz app (where you can get the full, uncompressed data). So I can't confirm the theory that it's a hardware problem.

[RickN55]

interesting, I have the feeling that it is much worse with the 6.60. Since I'm riding the same route again at the weekend, where I only have 6.60 (450m descent and 1050m ascent) on this route there is actually only (50m descent and around 600m ascent).

I've now got the 4.80 back and now have very good results:

The route was an approximately 1.3km long gently sloping mountain road.
Only on the climb does the Gpsmap 67 have 20m and the topo map only 2m, but the descent is very accurate.

Although I find that the Garmin map data is not always very accurate, I have already seen differences on the same route with Basecamp and the Topo Switzerland app

I can relate to this, I've gone back to past activities from last year where the 67 was on 4.80 and 5.30, the ascent and descent was more or less spot on with the same routes recorded with my 65 and Epix some are abit higher still granted, but all activities on 6.60 are at least 50% higher on both fields for the same walk than the same routes on the 65 and Epix. 6.60 is defo the worst.

My new device (4th) is arriving tomorrow ( Yes I must love the new device smell and feel) but I am no updating it and going to walk the same route on the 4.70 software see what it throws up.

Also as anyone noticed on their 67 you can sometimes be walking on the total flat or downhill and the Ascent field will still rise a couple of feet?

Also if I plug my new device into express to register it and get the latest sat files it won't auto update to 6.60 will it? Or am I besst just not plugging in?

[luvvinbird]

Both my 67 and eTrex SE update automatically when plugged into my PC with Garmin Express turned on. None of my other Garmin devices do that. I thought that it was MTP on both of those devices that caused that. I miss having the option of installing or not installing updates.

[RickN55]

Both my 67 and eTrex SE update automatically when plugged into my PC with Garmin Express turned on. None of my other Garmin devices do that. I thought that it was MTP on both of those devices that caused that. I miss having the option of installing or not installing updates.

I will refrain from plugging in when it arrives unless I have to for the CPE files, I know when they're new they take for ever to pick up a signal if not plugged in. Did it prompt you the next time you turned the device on if you want to install the update or not?

My last 67 I got a few weeks ago I plugged into Express didn't press the update for 6.60 but when I unplugged the device it said there was a software update, do I want to install, at that point I did to see if it was 6.60 or the device I had sent back to get that one, but it was the 6.60 so I will be avoiding updating my new device when it arrives at all cost!

[luvvinbird]

Both my 67 and eTrex SE update automatically when plugged into my PC with Garmin Express turned on. None of my other Garmin devices do that. I thought that it was MTP on both of those devices that caused that. I miss having the option of installing or not installing updates.

I will refrain from plugging in when it arrives unless I have to for the CPE files, I know when they're new they take for ever to pick up a signal if not plugged in. Did it prompt you the next time you turned the device on if you want to install the update or not?

My last 67 I got a few weeks ago I plugged into Express didn't press the update for 6.60 but when I unplugged the device it said there was a software update, do I want to install, at that point I did to see if it was 6.60 or the device I had sent back to get that one, but it was the 6.60 so I will be avoiding updating my new device when it arrives at all cost!

Yes it did.

[RunnerAndrew]

I have had issues with ascent figures recorded being double what they should be on every activity I record , unit has been replaced once before and has the latest firmware , some of my earlier recordings on the first firmware versions are still high but certainly not double.
Anyone with the issue needs to raise a support ticket as Garmin support advised me or many cases reported and unless people raise a ticket they will not be aware of the extent of the issue.