Assertion: plastic sextant | /r/CapableOf | provide less-expensive alternative
Facets:
value: for looking for a back
type: PURPOSE
value: to metal sextants
type: OTHER
Source sentences:
text: While it is true that they are not as accurate as metal sextants and they are indeed more sensitive to the sun than metal sextants are, plastic sextants can with special care still be used quite successfully for practical navigation at sea, and they provide a less-expensive alternative to metal sextants, for both new navigators or seasoned mariners looking for a back up to GPS.