Unfortunately, I have to leave for work in about five minutes, so I can't really provide a detailed response just yet.
Most of the race lines that you see set up can be used by anyone wearing their SLSF Member group title. If you're right next to the line and you click on it, it'll tell you to say "+help" for instructions.
+reset will reset the timer
+start will start the timer, which is normally set for a countdown of two minutes
+results will give you the results of a race after it's done
You can also set the number of laps you want for a race or change the countdown before a race and some other things that I can't remember.
I believe all the clubs welcome others to use their start lines for practice or their own races, so long as it doesn't conflict with their own scheduled use times. Take a look at this thread of
sailing locations which is where you'll find a list of the race lines. Just remember to have that SLSF Member group title on to use those lines.
You shouldn't even feel obligated to use the courses that the other clubs use. For instance, I recently used the
Cristabel race line and created a quick course I dubbed The Volcano Run, which is not a standard BSF course.
I suppose the other thing that's helpful to know is how some clubs like to keep score of their races. Unfortunately, I'm all out of time to tell you! Here's the thread for where the
SYC keeps scores and the
VYC keeps scores.
Hope to catch you in world for some racing sometime!