GPS-Tracker Pro is a free iPhone app developed by Marvin Wagner that turns your device into an advanced GPS tracker. Whether you're hiking, biking, driving, or even flying, this app allows you to record your activities and view them later.

Once you start recording, you can track your route live on the map. The app not only records your current location but also tracks your speed and altitude. You can pause the recording at any time and resume it later.

During and after recording, you can view various values such as distance covered, duration, number of recorded locations, average speed, maximum speed, average height, lowest height, and highest level. Additionally, you can create markers on the map to save interesting places you want to remember.

The app offers customizable settings that can be adjusted at any time, including notifications for inactivity and poor reception, interval of status reports, desired GPS accuracy, removing filter, map type, display options for current position, starting point, end point, and marks. You can also choose to have a background path, a multi-colored path, and a dynamic scale for better visualization of your recordings.

You can share your recordings with friends via AirDrop, email, or iMessage, and export them in various formats including GPS Tracker Pro, KML, GPX, and CSV.

Please note that if you don't have a GPS-enabled device, you will need an additional GPS receiver to start recording. Also, keep in mind that continued use of GPS running in the background can significantly decrease battery life.