

祖父は若い頃、船で世界中を航海したそうです。
いつかヨットで太平洋を航海してみたいです。
嵐の中を航海するのは危険ではありませんか。
"こうかいする(航海する)" is in the lesson "Sports 1" (Level 23), along with 13 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.