DashCam-PRO

GPS tracking with Video Capture, useful to record your car trips.
Video contains speedometer and map, complete with audio recorded live from microphone, and can be exported to photo library and/or reproduced inside the app;
Lite version displays banners; you can remove them via in app purchase.
features:
- top speed adapts automatically
- speed units and many other parameters can be changed
- shows horizont line and cars detected via opencv
For ships:
- you can configure app to connect to NMEA wifi and display OpenSeaMap with harbour data.

The car detector is based on this article :
http://abhishek4273.wordpress.com/2014/03/16/traincascade-and-car-detection-using-opencv/
thx to Abhishek Kumar Annamraju for his contribute

This app uses gps in background when tracking is active (note: in background the video can't be recorded, a fixed frame will be shown in video).
Continued use of GPS running in the background can dramatically decrease battery life.