i've looked through a lot of web pages but I'm still full of doubts even if this system is possibile:
I would like to build a device capable to receive a sound from a "microphone" in the water, correlate it with a precise time which is synched with GPS time (every 1 sec if I got it right from common shields), link it with the lat/long from GPS and then send it wireless to other devices:
can you help me understand which is the best devices and if they can fit toghether ?
arduino board, which one? (YUN or is better to use a "normal" arduino + zigbee?) gps shield waterproof microphone audio shield (do i need an audio shield even if i just need to receive a constant pulse which I can choose ?) magnetometer
the system should minimize the time error between the instant the pulse is received at the microphone and the UTC time from the GPS.