Final answer:
If a navy vessel passes three blasts of a whistle while rendering passing on her show to another vessel, the action that should be taken depends on the context and situation. In general, passing three blasts of a whistle is a signal for a change in course or direction. The specific action to be taken would depend on the instructions given by the commanding officer or the navigation rules applicable to the situation.
Step-by-step explanation:
If a navy vessel passes three blasts of a whistle while rendering passing on her show to another vessel, the action that should be taken depends on the context and situation. In general, passing three blasts of a whistle is a signal for a change in course or direction. The specific action to be taken would depend on the instructions given by the commanding officer or the navigation rules applicable to the situation.