Final answer:
Daymarks use color and shape to identify the beacon upon which they are mounted. These visual identifiers help mariners navigate during daylight by providing crucial information about the waterways.
Step-by-step explanation:
The features of a daymark that are used to identify the beacon upon which it is mounted are its color and shape. These visual markers are critical for navigational aides, providing clear identification during the daylight hours. Mariners rely on these characteristics to determine their position and safely navigate through waterways. The color can indicate information such as the side of the channel a vessel should pass on, while the shape can offer guidance on the type of beacon, such as whether it is a starboard or port marker.
It's important to note that daymarks are distinct from light characteristics, which are used for nighttime navigation and include aspects such as flash patterns and light colors. The size, method of construction, and signal characteristics like frequency range or signal strength, although relevant to radios and communication devices, are not typically used to identify a daymark.