Does anyone know of a pitch & roll sensor suitable for installation on a
vessel? I need to log pitch & roll on a boat & compare it with signal
strength from a satellite receiver, so I need a sensor that will output as
USB for me to connect to a notebook & log it, along with signal strength data
from the satellite receiver.

If necessary I could use an RS232 sensor. I'm hoping for something reasonably
cheap. Definitely less than US$500.

Dave