Which of the following terms refers to devices that assist mariners in navigation?

The correct term that refers to devices assisting mariners in navigation is navigational aids. Navigational aids encompass a variety of tools and devices, including buoys, lighthouses, and GPS systems, that provide critical information to help sailors interpret their surroundings, understand their position, and make informed decisions about their routes. These aids enhance maritime safety by guiding mariners and providing alerts to dangers such as rocks, shallows, or other hazards.

Marine scouting, seafaring signals, and coordination beacons each have their own specific meanings and uses in a maritime context, but they do not encompass the broad range of tools and devices aimed at assisting in navigation like navigational aids do. For example, marine scouting generally refers to strategic observation or reconnaissance in marine environments rather than the direct tools used for navigation. Seafaring signals are more about communication methods than devices, while coordination beacons might imply a very specific kind of signal rather than the comprehensive suite of navigational tools that the term "navigational aids" encompasses.