I'm busy putting together a Rev/Speed chart of all the ships.
What do you find easiest to handle using the hydrophones... Some examples:
- Revs per minute (count revs over a minute, 30 secs)
- Seconds for XX revs (count 20 revs, timing it)
And then this info would be put into the Recognition manual, something similar to this pic.
http://img.photobucket.com/albums/v2...SpeedChart.jpg

