Navigation Charts - Kraken's Cove (Spoilers)

[j.l.atreides]

It was mentioned earlier in the Adventure Path (Bullywug's Gambit) that Kraken's Cove had a huge reef protecting it, and one needed a chart of the reef to accurately plot a course through it.

My question, as a DM, is where in the adventure can the PCs come across this chart, so that they can get the Sea Wyvern out of the cove without wrecking it on the reef? It isn't mentioned in either room that it would seem to make sense, nor is it mentioned in the brief description of the Sea Wyvern.

So, any help for a confused DM type?

[MarkB]

The Trophy Cave (K8) contains a set of old, but highly accurate sea charts. I just assumed these included a chart of the path out of the cove.

[Fiendish Dire Weasel]

Yep, in my campaign it was of the whole Shining Sea area (we play in the Realms), including Kraken's Cove.