Here are some waypoints I could find.
Note that I am
not the author of any of these waypoints.
p.s.1:Are you sure the map is named "cs_carsnrobots"?
I can't even find any map on the net with that exact name.
Only "cars_n_robots" where I also found waypoints for.
p.s.2:I'm not sure of the "cs_tank" zip file cause it is only 9 kb ( rather small for a "cs_" map )
p.s.3:Try to look
here first for any future needs or searches. I will try to post as many sites as I can find in my spare time. ( hint: search engines like yahoo and google and ... can also be used for waypoint search )