If a motorboat approaches you head on and sounds two shorts blast but you wanna pass on the left side which sound signal do you use to indicate disagreement?

If a motorboat approaches head-on and sounds two short blasts while you intend to pass on the left side, you should respond with one short blast. This signal indicates your intention to pass on the starboard side, which is the standard practice for vessels when passing each other. It's important to communicate clearly to avoid confusion and ensure safe navigation.