This is where the GPS speedometer comes in. In fact, the Strava app on an iPhone and an Asus tablet reported more accurate data than any of the standalone GPS devices we tested. In that test we found that GPS apps, running on a smartphone or even a tablet device, can record very accurate data. June 2015. I have a 64s and eTrex 20 and use both on my bikes. Problem is, the default implementation returns 0.0 as speed: apparently that is the default behavior.. What I'm currently doing, is as follows, consider location objects a and b, where a is taken first, b later: How can I get an accurate speed from GPS in Android? DaveM 161 Points. Garmin eTrex 10 Worldwide Handheld GPS Navigator. When connected to a cellular network the smart phone will download data about the GPS satellite constellation. How Accurate is GPS Tracking? This ground speed often differs from the miles per hour shown on a car's speedometer. And the accuracy of the speed will depend on how long it’s averaging over to get the speed. Speed with a GPS is relatively accurate when your speed is constant but less accurate if you're accelerating or decelerating. Speedometers can be 10% adrift. When it comes to tracking the whereabouts of a vehicle, asset, or person, GPS devices provide the most accurate information, but users often wonder just how accurate location data really is. The accuracy of the speed displayed on the vehicle and GPS device can vary depending upon whether the vehicle’s speedometer needs to be calibrated and/or how accurate your GPS reception is – Garmin The nitty gritty How Accurate Is GPS, Really? The assistance is provided by the cellular network. Even GPS watches have this limitation, though to a smaller degree. Figuring out which of those speed displays is more accurate is a bit tricky. We also found that most GPS devices overreport distances, though usually by less than 3%. I also have computers on all my bikes so can compare speed. By integrating Doppler-derived speed with this level of time signal reliability, an extraordinarily accurate distance measurement is achieved. In order to understand GPS tracking accuracy, it’s important to first understand how a GPS tracker works. Using the same 100km/h true speed from above, your vehicle could be travelling anywhere between 90km/ and 110km/h, which may lead to an unexpected speeding fine! GPS is much more accurate than a speedometer, even with a cheap GPS receiver. With the accurate WAAS-enabled GPS receiver, explorers can get accurate location information while still taking advantage of the 24K maps provided by the TOPO map downloader. GPS records accurate speed and location data for your Dash Cam while you're driving. GPS devices calculate speed based on your GPS position. Elevation-gain readings can be very inconsistent, though, because the changes in elevation are smaller, and slower. With a clear view of the sky, GPS speed has shown to be more accurate than most vehicle speedometers. +1 (646) 513-5727 | (+91) 888-466-0033. Click to visit the show page for the podcast in which this question is answered. HOW ACCURATE IS THE SPEED READING? I tried using the GPS, it works well but not for speeds that low. One of the most common questions asked by consumers and businesses interested in purchasing GPS is how accurate are GPS locators?The reason is that when a parent of a teen driver or company uses a GPS tracking device they want to be certain that the data provided by the location-based technology is accurate … I know speedos in cars are not necessarily accurate, but I fired up Torque on my Android and connected it to my OBD II reader and set up a view for both the OBD speedometer *and* my phone's GPS speed readings. I would need very accurate speed for my app, even when the user is only walking. While some may argue that the speed returned by a GPS receiver is higher than the speedometer in the vehicle, most modern GPS receivers can collect speedometer readings using the OBDII port. Using what it calls “Helicopter View”, you can literally watch as your vehicle moves along a satellite map in real-time – a bit like 007 tracking a crime boss from an overhead chopper. From the NAVSTAR GPS User Equipment Introduction document Section 3.7: GPS receivers typically calculate velocity by measuring the frequency shift (Doppler shift) of the GPS D … Bottom Line: Some basic testing of the accuracy of GPS on the iPhone, and a Pythonista script to text someone your GPS location. In this post, I wanted to publish my results on a little testing of the accuracy of the GPS on my iPhone 5, … A-GPS operates a little differently than the typical handheld GPS receiver. 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