'Coastwise' definitions:

Definition of 'coastwise'

(from WordNet)
adverb
By way of, or along the coast; "we were travelling coastwise"
adjective
Along or following a coast; "coastal shipping"; "coastwise winds contributed to the storm"

Definition of 'Coastwise'

From: GCIDE
  • Coastwise \Coast"wise`\ (-w[imac]z`), Coastways \Coast"ways`\, adv. By way of, or along, the coast; following a coastline; as, coastwise winds contributed to the storm. [1913 Webster + WordNet 1.5]