I always go with the one that records the most elevation and mileage.
Same here.I see this all the time on rides. Phones are not that accurate when it comes to GPS activity.
WHat if one gives more mileage, the other more gain?I always go with the one that records the most elevation and mileage.
probably crap. if it can only handle 3 satellites at once, then there will be times you don't have a position fix. sometimes satellite geometry sucks and you need 4 or more for an actual position fix. that usually isn't a problem for modern GPS chipsets that can handle GPS sats plus Russian GLONASS birds and some even handle Euro Galileo sats in addition. that's a LOT of possible satellites to use for a position fix. if your cheapie can only use 3 sats for tracking, I wouldn't waste my money.Interesting thread. I just ot a small cheap Chinese cyclometer that says it uses 3 satellites to track you. I wonder how this would compare to my phone. I might have to try this.
what's your threshold for "accurately"? pretty certain it's not anywhere in the same ballpark as mine.So far it has accurately tracked deviations to my routes. But this is not out in the wilderness or anything. I only got it to see if this is even something I wanted before spending money on a nice one.
Three satellites are the minimum required to location (longitude and latitude) along with elevation. If you don't need elevation, only 2 satellites are required.Interesting thread. I just ot a small cheap Chinese cyclometer that says it uses 3 satellites to track you. I wonder how this would compare to my phone. I might have to try this.
Each of those is a constellation of satellites. each constellation has dozens of satellites in it. you can't connect to all of them at once (physically impossible because they're covering the whole globe). it also doesn't tell you how many the receiver can track at once, but it gives you more options to get a quality position fix when conditions are poor.This is the satellite info. I am not sure if it means 3 satellites or 3 types of satellite systems.
"the bike computer positioning system is connected to 3 satellite connectivity: GPS, GLONASS, Galileo." This type of stuff is foreign to me.
a fix on 2 satellites does NOT give you a 2D position. That requires 3 satellites. 4 satellites is required for a 3D position (coords plus elevation).Three satellites are the minimum required to location (longitude and latitude) along with elevation. If you don't need elevation, only 2 satellites are required.
How GPS Determines Your Position
At a minimum, your GPS receiver needs three satellite signals (aka “fixes”) to determine your position, which is called trilateration.
With one signal, you can be anywhere within the surface of the sphere.
With two signals, you can be anywhere on the blue line where the two spheres intersect.
With three spheres, there are two intersection points. This is called trilateration. One fix will be on the Earth’s surface, the other one will be in space. The GPS chipset will discard the one in space and give back the position of the one on the surface. Garmin also calls this a 2-D position.
Adding a fourth satellite will give you one point of intersection, eliminating the need to discard the point in space. It will also allow the GPS to calculate elevation. This is sometimes referred to as your 3-D position. This fourth signal is also used to sync time. Most GNSS systems strive to have their satellite orbits distributed so that at least four satellites are always visible from any point on the Earth at any time for this reason.
No. a cheap wired cyclocomputer cannot do these things. The critical thing here is saving data from your ride. What GPS permits is recording where you are and at what time. Speeds and elevations can be calculated from that, and if you have other sensors, you can really start piling on the data. In the heydey of cyclocomputers, the most expensive ones could record, but any data they recorded had no position to associate with. Just time and distance. It gave some rudimentary analysis capabilities if you rode exactly the same route.You are correct that accurate is not the correct term here. I should have specified larger than a bread box change, lol, as I am not referring to small couple feet variations. Also not mileage. I can upload my data and see the map of my route. If I take a path that slightly different on the way back from the way to it will show it. For example, my driveway vs the side walk it shows this. Again I only got this cheap one because I wanted to see if I even wanted to get a cyclometer. I wasn't going to throw $200+ at something I didn't even know if I wanted.
I am liking being able to track my routes and speed and upload them to strava. I like being able to compare previous rides to my new one and break that down to smaller segments as well. Is that possible with a wired system?
Puddle PirateThese Puddle Jumpers getting lazy with their modern GPS systems...