You possibly can previously utilize phone network to acquire authentic time frame info by GPS trust areas, so it achievable and also lawful. Throughout my own nation companies including Leica SmartNet and also Trimble VRS TODAY deliver this for six hundred for you to 2000 per annum for your subscription, directed at surveyors using 12, 000 dualfrequency GPS receivers. 12, 000 study GPSes receive this GPS sign with a couple frequencies, and also make a move known as service provider ambiguity resolution to generate very exact opportunities (within regarding 2cm). They need large, prime quality antennas with branches to keep them earlier mentioned brain top, and also people ready to make sure this antenna is always directing upward using great lineofsight towards satellites. On the flip side this 12 GPS from a cell phone makes one volume and also doesn possess service provider ambiguity resolution computer software. This antennas are modest and also low-cost, this people be expecting them to work indoors motor vehicles, presented with just about any point of view, and so on. Owing to these difficulties people wouldn receive the 2cm reliability study GPSes deliver. If you have been happy, this reliability would have been a couple of meters much better above recent reliability, but not a new gamechanging betterment. GPS Modernisation and also Galileo, which have been the two simply throughout the nook, may possibly deliver greater enhancements. TLDR: Using smart phone amount price/ease of use some great benefits of carrying out this would be a little limited. Firms are improved away needing Galileo and also reassessing this company surroundings in that case.