Canadian Boating Exam Practice Quiz

Which signal is used by an underway power vessel?

1. Prolonged blast every two minutes

2. Five short blasts

3. One prolonged plus two short blasts every two minutes

4. Three short blasts

The correct answer is: Prolonged blast every two minutes

Power vessels when underway typically use their onboard horn or fog signal to communicate their movements and presence to other vessels in the area. This is important for avoiding collisions and maintaining safe distances between vessels. Option A, a prolonged blast every two minutes, is the correct signal typically used by underway power vessels when they are not in restricted visibility or making a turn. The other options such as five short blasts, one prolonged plus two short blasts every two minutes, and three short blasts are used for different situations such as maneuvering, overtaking, and backing up respectively. Therefore, these options are incorrect in the context of an underway power vessel.