If, however, you know from knowledge of your boat, that it could have covered only 5 n. miles in the quarter of an hour measured during the running fix manoeuvre, then you will know that 8 nm. is impossible.
Ukuba ngahlobo luthile uyayazi kulwazilwakho ngesikhephe sakho ukuba ibinokwenza 5n yemayile kwikota yeyure elinganiswe kumxube wobaleko ngoko uzakuyazi ukuba 8nm ayinakwenzeka