What is the purpose of deflection devices and ring guards?

Deflection devices and ring guards are designed primarily to provide a protective barrier around the propeller of a vessel. This safety feature is critical because it helps prevent injuries to swimmers or other individuals who may inadvertently come into contact with the moving propeller, significantly reducing the risk of accidents.

Additionally, these devices help channel water flow towards the propeller, potentially improving efficiency and performance while also helping to reduce cavitation. The design inherently emphasizes safety, ensuring that the propeller is shielded while still allowing for effective operation of the vessel.

The other options misrepresent the primary function of deflection devices and ring guards. Increasing the speed of a vessel, serving as navigational aids, or signaling other vessels during foggy conditions are not their intended purposes. The focus on safety and accident prevention underscores the importance of these features in boating operations.