GPS Data delivers all of the current location information available from your device, including GPS, compass, and barometer data.
GPS Data displays the following information, in an easy-to-use list format:
• Current time
• Time since last update
• Accuracy of readings
• Latitude & Longitude coordinates (decimal degrees and degrees/minutes/seconds)
• Elevation (meters and feet above sea level)
• Speed (meters and feet per second, kilometers and miles per hour, and knots)
• Device direction (degrees true and degrees magnetic)
• Direction of device movement (degrees true)
• Local air pressure (hectopascals and inches of mercury)
• Vertical speed (meters per second and feet per minute)
Additionally, on iOS, any altitude, speed, or direction value can be expanded into a larger, full screen display, useful for monitoring different values when you're on the move.
From the developer’s store description.