24.18 and 24.19 Grade % wildly inaccurate

On both of our 840s and my 540, 24.18 and 24.19 grade information is inaccurate and very jumpy. Today's ride was on a Rail-Trail, so I know the grades are long and very consistent. The Edges will show a descent when we are clearly climbing and the values jump all over the place. Worst example was a long 2% climb, which Edge beta prior to 24.18 correctly identified. 24.19 identified the grade as -4%, yes, a 4% descent.

Top Replies

MartinC700 2 months ago +5

Totally agree, before this update the grade was very laggy but essentially accurate. Now it's all over the place, sometimes it represents the grafe well, other times it jumps around like crazy. For example…
Todd727 2 months ago +2

I forgot to add, Climb Pro has these climbs in the database. Climb-Pro correctly shows what the grade should be, but Edge shows the crazy numbers that don't match.
1311649 2 months ago +2

I had the same problem today, doing a climb I know with my eyes closed and at a point that is 14/15% it showed 5/6% I was soooo mad as this Garmin is two weeks old!!!! GARMIN FIX THIS RIGHT AWAY!! We are…

All Replies

0 MartinC700 2 months ago in reply to aweatherall

Oh, I guess that might be the case, can't say categorically. I'll check next ride.

0 Todd727 2 months ago in reply to aweatherall

No, power on, calibrate power sensor and ride

0 2888722 2 months ago

Same issue here. Support chat sent me a new device but now I’m realizing it’s not just me.

0 MartinC700 2 months ago in reply to MartinC700

Ok, turned off the 1040 last night on again this morning before the ride and today the gradient display was fine, accurate gradient and quick responses. Seems like on my unit anyway the sleep mode must affect it.

0 Perna_81 2 months ago

I have same trouble on my 840 - it starts around 3 weeks ago. Totally gradient seems ok but live climb is out. Real uphill 9-10% is displayed from -2% to 3% at this point on constant gradient hill.

0 b3n 2 months ago

Same. Grades are often quite a bit off on my 840 with the recent firmware. Usually runs lower than reality, like 0% on a 4% climb.

0 bvahey 1 month ago in reply to 2888722

I had the same issue and they sent me a new device - that made me happy for about 2 weeks when I realized it too suffers from the same erratic grade and elevation issues. And yeah way off like climb pro recognizing the climb yet the gradient being zero or negative for the entire climb. Go figure.

0 ohramown 27 days ago

Grade % is everywhere. Just got my 840 and it updated to 24.19. Took a regular route and the gradient was way too jumpy and inaccurate. Upgraded from an edge 130 and beginning to regret buying the 840. I hope they release an update.

0 lakeviewbiker 21 days ago in reply to ohramown

Yep. I don't understand how Garmin can let this go so long without a fix. Gradient is a big deal and one of the main reasons I use such a device when riding on the West Coast of California. Not my idea of quality or customer service. I have a knock off cheap GPS from China that works properly with grade etc .. it was less than 100 dollars. Come on Garmin.

0 F._Lara 20 days ago

I just bought an Edge 840 and thought the grade was wrong. I was hoping it was something that could be fixed by some parameter in the settings but now I see it is a firmware issue. That is disappointing, one expect a device like this to be able to measure the grade with acceptable accuracy.