The free My GPS Coordinates app (available for iOS and Android) has functions to email or text your coordinnates directly from the main screen, and even shows the accuracy of the GPS … I am considering building an iPhone GPS app to assist runners. The A-GPS receivers on iPhones have steadily improved from the iPhone 3 to the iPhone 5. 1 The sun. Speedometer Features. Although GPS tracking is the most accurate compared to WiFi based and cell tower based tracking techniques, there are a few factors could affect the accuracy of GPS positioning accuracy which could affect cell phone GPS tracking. The Lezyne Mini GPS had a real problem here, showing wild elevation variations of up to 53 feet in a single test. In addition to the U.S. DOD GPS system, the Russians have a satellite navigation system called GLONASS . Speed Tracker iOS Free, unlock the full version for $3.99. Both analog and digital speedometers; Shows accurate speed from your iOS device’s built in GPS; Shows speed in kilometers … Is the iPhone 3GS or the new iPhone … On this measure, the Strava App on iPhone 6s is the most accurate, averaging just 1.2 feet between the minimum and maximum elevations reported. On your iPhone or iPad, open the Google Maps app . So if it's averaging for 10 minutes the GPS will be more accurate, if it's averaging over 2 seconds the speedometer will certainly be. Tip: This will also improve your search results and make them more relevant to you. A simple efficient and accurate GPS speedometer for your iPhone and iPad. A-GPS uses smartphone networks in combination with a GPS antenna to increase the speed of determining or fixing position . However, data collected using A-GPS is less accurate than traditional GPS receivers [13, 14, 15]. iPhone GPS issues are not as common as Wi-Fi issues or problems with Bluetooth, but some people reported that at times GPS is not accurate, or the location of the user cannot be recognized at all. I have also noticed that periodically, when I pull up the native NAV system in my Sync3 unit, it will display no GPS in the lower left corner of the map - and that's without my iPhone plugged in. Most of the time, GPS problems on iPhone occur right after the user upgrades its device to the latest version of iOS. The newest smart phones (e.g., iPhone 4S and iPhone 5) now have GPS chips that use both satellite systems giving increased accuracy! Yes, the sun almost affects everything in the solar system. And the accuracy of the speed will depend on how long it's averaging over to get the speed. Speedometer for iPhone. A-GPS precludes the need of a warm-up period required for traditional GPS units . 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