What does the Spyglass do?

[midnite rule]

Serafen says you need a spyglass for the stealthy approach to Fort Deadlight. Found one, but it doesn’t give me any extra options. The row a skiff to shore option was already available to me.

Is this a bug?

[Clawdius]

I mean, I didn't know what it's supposed to do at Deadlight because I always hoist a Principi flag (usually acquired from Neketaka by doing the Old City stuff, otherwise looted from Beggar W..infirth?) and sail right into the harbor.

At any rate, the spyglass comes in handy for a variety of encounters at sea, giving you more of an idea about plague ships and a wrecked smuggler ship and such so it will have uses. From what I've read, despite Serafen's conversation check, it doesn't actually come up when you make the trip to Fort Deadlight.

[midnite rule]

Well, good to know it will be of some use.