Assertion: radio wave's wavelength | /r/HasProperty | useful
Facets:
value: very
type: DEGREE
value: for marine navigation
type: PURPOSE
Source sentences:
text: These wavelengths are nevertheless very useful for marine navigation as they can travel very long distances and "over the horizon", which is valuable for ships when the line-of-sight may be only a few tens of kilometres.
text: Wavelength can be a useful concept even if the wave is not periodic in space.