信号枪只能使用一次。作为武器，可以增加你的体型；或者在自己的回合中作为一个行动，你可以决定当轮翻开的航行牌中的飞鸟并且无视航行卡的其他功能（落水和口渴）。失去一个海鸟意味着移除一个海鸟
What's the deal with the Flare Gun?
This item gets used once. If used during a fight as a weapon, it adds to the size of your side. If used as your action during your turn, you resolve only the birds on the revealed navigation cards. Ignore everything else on the cards. A “Lose a bird” result means you lose a bird.
可以在船的位置上标记一般的话，不用标记物问题也不大
