The project concerns developing an application for mobile devices that offers an intuitive AR interface supporting safe water navigation based on improved GNSS positioning, determining and optimizing the predicted trajectory with 3D data and image/scan. Location and AR technology will offer new user-positioning functionalities, link it to augmented reality and enable safe navigation. The project is addressed to the whole water tourism sector. We can specify, among others: sailors, anglers, kayakers, water rescue services. The developed solution will constitute another milestone in the development of the Zegluj (Sail) mobile application created by the company. It will allow the development of solutions based on the latest knowledge in the field of positioning, navigation, geodata processing and their visualisation in mobile solutions.