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by nradov 3405 days ago
Vehicle speed and steering position are available through OBDII. And inexpensive Bluetooth OBDII interfaces are available. But I don't think that navigation app developers have done anything to take advantage of that data for dead reckoning input.

http://www.plxdevices.com/category-s/195.htm
2 comments
maxerickson 3405 days ago
Telenav implemented ODBII in their OpenStreetCam software:

http://wiki.openstreetmap.org/wiki/OpenStreetCam

link
mrpippy 3405 days ago
I believe Apple requires CarPlay radios to provide wheel speed and compass readings (along with GPS) to the iPhone, and it gets used by CoreLocation to report location to apps.
link