Since this is in the car I had this non-waterproof back on. The camera shipped with a waterproof back and one that isn't waterproof but is to be used when you want the barometric pressure sensor to work. The difference was the mount as well as I had a different back on the case. As in I am going a pretty constant around 70 MPH and I saw readings north of 100MPH. Maybe that is the vibrations but this new mount is much more rigid and it goes even more whacky. I did a bit of searching and I did find something in the Garmin forums stating that calculated GPS speed is for rapid speed changes. Like last time this was about 20 minutes into the the trip but that was edited out because it was boring being stuck behind the cars that are in front of me as the clip starts. This time I used a suction cup mount on the windscreen. Maybe but I am not thinking this is the case because in this second video is from a different trip on a different section of road. I don't know that the noise was from a bad mount. This song was available as free use in the Virb Edit software.Ĭlick to expand.So I did another test the other day. I had the radio on and deleted the audio and dropped this song in the place of what was on the radio to avoid any copy-wright issues. No I wasn't listening to that goofy song. I was shocked by this.Īlso ignore the music. It took about a mile of driving before the speeds started to come together. Before the internet police show up the speed limit on this section of road is 60. Even though I was going a pretty constant speed around 63-64 it was reading 10 MPH faster. It was reading 10-15MPH faster than OBD-II for much of the time. The GPS speed was consistently much higher than the OBD-II speed. What really shocked me is when I pulled away from the stop light. However while the readings are pretty close the GPS speed never dropped to 0 but got down two 2 MPH. The interesting thing is that as I come to a stop you will see the OBD-II speed show 0 MPH as I came to a complete stop. The speed on the lower left above the OBD-II speed is the one based on 3D GPS. The bottom one is OBD-II speed as is the round gauge on the lower right. The key thing I will call your attention to is the speed readings in the lower left corner. Now my WRX has a sun roof and the camera is strapped to the passenger headrest so ignore all the shaky cam. So the camera has had plenty of time to get a good 3D fix to minimize the drift as it acquires a good signal. However in this clip I was probably 25 minutes into my commute and coming up on a red light on the highway and as I came to a stop it went green. As I mentioned it is pretty normal for GPS speed to jump around when you first power it on. This was the same first drive that the original screen shot was from in the earlier post but I have tweaked the gauges a bit. I drive like this in the winter because in default mode the car steps in a bit more than I like. In the clip I was on the highway on wet roads so I was in economy mode (Sport Intelligent) which dials back the car a bit for better economy but traction control was dialed back which are the warning lights on the instrument cluster. So here is what is going on in the video. Click to expand.I know I said I wasn't going to post a video but the more I was thinking about what you said about the MPH made me think to go in and play with the settings a bit.
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