Final answer:
When two power-driven boats approach head-on, there is a risk of collision, and appropriate actions should be taken, such as altering course and decreasing speed to prevent an accident.
Step-by-step explanation:
When two power-driven boats approach each other head-on, there is a risk of collision. This scenario requires boaters to be aware of navigational rules to prevent accidents. It is a standard maritime rule that when vessels are on a collision course, both should alter their course to starboard (to the right) so that they pass on the port side (left side) of each other. Decreasing speed may also be a prudent action to ensure safety and provide more time to assess the situation and react appropriately.