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Some Garmon's have an option to set the wheel circumference, if that is set, then it would not matter as it counts revolutions
How do Garmins/GPSs cater for hills?
- Thread starter Dave7
- Start date
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NorthernDave
Never used Über Member
- Location
- The real Northern Powerhouse
I thought Garmin used a combination of highly sophisticated algorithms, highly detailed 3D mapping software, paired with super accurate GPS readings and then just guessed? 
My experience (Edge 810) is that the same route can produce wildly differing readings. On one route last summer I managed to cycle along for several miles at well below sea level. However today I've cycled the same road and Garmin assures me that it's 185m above sea level.
The internet (checking OS data) suggests it's actually 10m above sea level.
I'm going to assume that the OS is closer to the mark.
EDIT: just checked and my Edge 810 gives an elevation gain today of 514m. My mate (who was out on exactly the same ride with me) has a figure of 606m elevation gain recorded on his Edge 25.
My experience (Edge 810) is that the same route can produce wildly differing readings. On one route last summer I managed to cycle along for several miles at well below sea level. However today I've cycled the same road and Garmin assures me that it's 185m above sea level.
The internet (checking OS data) suggests it's actually 10m above sea level.
I'm going to assume that the OS is closer to the mark.
EDIT: just checked and my Edge 810 gives an elevation gain today of 514m. My mate (who was out on exactly the same ride with me) has a figure of 606m elevation gain recorded on his Edge 25.
Last edited:
Ming the Merciless
There is no mercy
- Location
- Inside my skull
The edge 305 has barometric and that dates from around 2004.
HLaB
Marie Attoinette Fan
My old geko needed to be calibrated but I think the newer garmin's have an auto calibrate. I usually ride to a meet point and reset the unit and that seems to avoid odd results but with the newer one I don't think I even need to do that.
ColinJ
Puzzle game procrastinator!
- Location
- Todmorden - Yorks/Lancs border
My Edge 500 (which has a barometric altimeter) is hopeless for elevation. I have set an elevation point outside my front door so it always knows the true elevation when I set off. I did a short ride today (28 km with about 560 m of ascent) and the GPS was insisting that my house had sunk more than 10 metres by the time I got home!
The elevation point is loaded when I start logging the ride. Before I did that I had a very good satellite signal but the device thought it was 150 metres lower than it actually was.
My old Etrex does NOT have a barometric altimeter but its elevation readings tend to be more accurate (nearly always < 10 metres error and often < 5 metres).
The elevation point is loaded when I start logging the ride. Before I did that I had a very good satellite signal but the device thought it was 150 metres lower than it actually was.
My old Etrex does NOT have a barometric altimeter but its elevation readings tend to be more accurate (nearly always < 10 metres error and often < 5 metres).
