The GPS system has been of great public benefit for, for example, giving directions and locations. When the navigation system is used it is usually followed in real time, which makes it essential to provide reliable information for the user. In urban environments where areas are surrounded by many, tall buildings, the satellite signals can be affected before they reach the GNSS-receiver, which has a negative effect on positioning accuracy. This is one of the major challenges of positioning in an urban environment. The study examines how the accuracy is when positioning in an urban environment with the help of the mobile devices iPhone X and Huawei P20 Pro by using the navigation app GPS Coordinates with the aim of studying how precisely the mobile devices can enter the location information. Furthermore, a comparison is also made between measurement with the mobile devices and Network RTK with Trimble R10 in the same environment.

The survey was carried out by measuring three known points in an urban environment with the units iPhone X, Huawei P20 Pro with the respective navigation app and Trimble R10. The measurements were performed for two separate days. One measurement per point in one hour was done during a period in the morning and then the measurement was repeated for a period in the afternoon. The coordinates of each point and measurement are read at intervals of 60 seconds for the mobile devices and for 180 seconds for the rover (Trimble R10). The results from the measurements show that it is not possible to achieve an accuracy on centimetre level when positioning in the specified urban environment with the help of iPhone X and Huawei P20 Pro, the accuracy is not better than a few meters. However, it is possible to achieve good accuracy when measuring with the Trimble R10. The measurements with the Huawei P20 Pro generally received a lower accuracy than the iPhone X, mainly at point 10317316. In addition, the results when positioning in an urban environment using the mobile devices are not as predictable as for the Trimble R10. Although the iPhone X achieves a higher accuracy than the Huawei P20 Pro, the result is not reliable as the time intervals when measuring with the iPhone X were updated irregularly, which means that the 60 second intervals could not be kept continuous, which should be improved for a more comparable and reliable result.