Having satellites located at different angles and distances increases the margin of error exponentially. The reality is that this is impossible, or at least highly unlikely, so we are already suffering from errors by simple concept. This would place us in the centre of the satellites in the vertical plane. To estimate the height optimally we should have a satellite just above us and then have at least three other satellites located at the height of the horizon and with the same separation between them -120º. To explain it quickly, the satellites in the sky are not all at the same angle to us. While in the 2D (horizontal) plane the accuracy of a GPS is quite high - usually with a low error of a few meters - the vertical location (the 3D plane) has a much higher error for simple geometric reasons. Other models have a barometerBut don't go into that section yet if you have a watch with a barometric altimeter, because first you have to understand this concept well because even if you have a barometer this point is basic to understand how it works.Īt the time of measure height by GPS the data is obtained through a complicated mathematical algorithm to determine your location, both in the horizontal and vertical plane. They are not low-end models, but are intended to be used mainly for training and road racing, which means that the manufacturer believes that the typical user of these models will not be faced with many variations in altitude and measurement is done via GPS. Here for example we can find the Garmin Forerunner 235, Polar Vantage M, Suunto Spartan Trainer and Sport. Basic not because of performance but because they are in the mid-range or low-end of each manufacturer. The GPS altitude measurement is the usual way to measure the height in watches considered more "basic". So how does the technology work? Well, that depends on what your device has, but I'll explain it to you below. barometric altimeter of a GPS or cycle computer clock is to provide approximate data and trends, but we should never expect millimetric accuracy simply because of how the technology works. The first thing you should be clear about is that a GPS watch has several different ways of measuring altitude, but that it is not a precision instrument. What is true is that it is something that can happen, and in fact it is perfectly normal for it to happen. Is your watch broken? Why does this happen? Well, it's neither broken nor is the explanation the same in every case. And you get annoyed, because when you see the activity on Strava it marks only 30 positive meters or the altitude data does not match. It's a frequent complaint among GPS watch users and one of the recurring comments in the testing of any GPS watch I make, whether or not the device in question has a barometric altimeterYou complete a training session on the promenade and when you finish, your watch indicates that you have climbed 200 positive meters (including some with a dedicated altimeter). Altitude measurement by barometric altimeter.
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