[chitu]

The application is is used in the absence of GPS Signals [ Absence/ Lose of GPS Signal due to interference of other signals [ Reasons may Vary ] .So the GPS receiver suggested .... will not helpful.

So looking for a sensor with the following criteria

1. That will give exact vehicle speed .
2. Mounting should not be a problem
3. Good Performance in harsh environments and able to give good reading in regions like terrain and others where there could be more slippage than the Normal Roads .
4. Cost Price < 500$


Can Any body give a relative comaprison why one should go for a RADAR Speed Sensor to Otpic Speed Sensor , other than the Cost Factor

Regards
chitu