Okay I think I understand now. They made the old tool into two separate tools now that actually work. With Snap guide lines on I can use anything that I want as a guide line and and I can use guide lines to make a other reference lines, circle etc for the snap to use as long as I like until I decide otherwise, similar to the old parallel /perpendicular tool of old before guidelines only better. thanks for letting me know that there is a separate snap tool so that I'd know to look for it.
