I assume you have read all the info available on this site?
Hi and welcome to the forum, it may be worth reading the information contained in the tab at the top of the screen, titled Dogging or click on the link http://www.swingingheaven.co.uk/dogging/index.html
A lot of couple do not necessarily use the signals and from the topics discussed on here, it seems the signals can vary from site to site. Might be worth investing a little time going back through some of the old threads and looking jsut how diverse things can be.
Anyway, enjoy and have fun!