T15Nav is a free navigation system for Android developed by T15 Competições - Valdecir Augustin. It allows you to generate the file through T15 Planilha and use it on your smartphone or tablet. This navigation system offers three different ways of using it. Firstly, you can use the box that sends distance and speed data to T15Nav via Bluetooth sensor in the vehicle. Secondly, you can use GPS, and lastly, you can use the calculated kilometer system that shows the distance and time of the test. T15Nav is a reliable and useful navigation system for Android users who are looking for a variety of options to navigate through their journey.