On Netduino homepage it is stated that Netduino can be powered by input: 7.5 - 12.0 VDC or USB. The car output voltage is 12V but the car voltage source can produce voltage spikes so I am not sure whether it is safe to plug netduino directly into car voltage supply without any additional protection such as voltage limiter.

Does anyone know if it is safe to connect Netduino/Arduino directly to car voltage supply?

Thanks