ダウ船 is read as だうせん (dausen) and means dhow.
だうせん
dausen
おおぶね
large boat
ふね
counter for boat-shaped containers (e.g. of sashimi)
ふうせん
balloon (hot-air or gas)
わたしぶね
ferry
どうせん
the same ship
きゃくせん
passenger boat
ひこうせん
airship
しょうせん
merchant ship
じょうせん
ship (carrying someone)
ほんせん
mother ship
ていきせん
liner
くろふね
black ships