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GPSMAP 65s - GPS speed vs. Speed Sensor 2
Posted: Sun Aug 21, 2022 3:01 pm
by ewald.gruen
Today I raced through the forest with the 65s on the handlebars at up to 33 km/h and later compared the GPS speed (calculated from the GPX file using a moving average and a 6-second window) with the speed measured by a Speed Sensor 2, and this is the result:
Code: Select all
| Min Speed | Avg Speed | Max Speed |
GPS Speed | 1.37 | 16.16 | 33.06 |
Speed Sensor 2 | 0.96 | 16.76 | 33.85 |
According to the header of the GPX file the maximum speed was 9.459 m/s (which equals 34.05 km/h):
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<gpxtrkx:MaxSpeed>9.459</gpxtrkx:MaxSpeed>
A detailed error analysis can be found in the appendix.
speed_comparison.png
Re: GPSMAP 65s - GPS speed vs. Speed Sensor 2
Posted: Tue Feb 14, 2023 4:21 pm
by RickN55
So basically the Speed Sensor is a waste of money if you have a 65s? I looked at buying the sensor for my bike but didn't bother as the speed on the 65s seems to do the job.
Re: GPSMAP 65s - GPS speed vs. Speed Sensor 2
Posted: Tue Feb 14, 2023 10:43 pm
by GPSrChive
RickN55 wrote: ↑Tue Feb 14, 2023 4:21 pm
So basically the Speed Sensor is a waste of money if you have a 65s? I looked at buying the sensor for my bike but didn't bother as the speed on the 65s seems to do the job.
Waste? No.
Unnecessary for most people, probably yes.
Re: GPSMAP 65s - GPS speed vs. Speed Sensor 2
Posted: Wed Feb 15, 2023 8:17 pm
by RickN55
Well I tried a Speed Sensor 2 today. Nothing but issues. It connected to my 65s but it would work fine showing the speed then the next minute it would drop connection and the speed would show zero and the device would be "searching" for the speed sensor. Then it would work then it would do the same again. No idea what was up with it. I even put a new battery in to see if the battery was low on power but made no difference. So sent it back to Amazon..
Re: GPSMAP 65s - GPS speed vs. Speed Sensor 2
Posted: Wed Feb 15, 2023 8:25 pm
by 0x01
Compared against an ordinary cycle computer manually calibrated by ruler, the GPSMAP 65s is extemely accurate (distance matching). I would not spend any money if you have a cycle computer already.