coastwise navigation

20 LETTERS · STARTS WITH C

coastwise navigation is a valid 20-letter word worth 28 points in Scrabble and 33 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3O1A1S1T1W4I1S1E1N1A1V4I1G2A1T1I1O1N1

3 + 1 + 1 + 1 + 1 + 4 + 1 + 1 + 1 + 0 + 1 + 1 + 4 + 1 + 2 + 1 + 1 + 1 + 1 + 1 =28 PTS

DOUBLE WORD → 56TRIPLE WORD → 84

MEANING

What does coastwise navigation mean?