In Assassin's Creed 4 offline, where can I find White Whales? I need the money from the skin to upgrade the Jackdaw to elite.
If you're not online, then you more than likely won't be able to find any White Whales on your map. White Whales are only found through online Community Events.
The White Whale is available with an online connection only during Community Events -- what this means is that the White Whale will show up in your game only if you are online.
White Whales only show up in the game when you're online and connected to the Ubisoft network. Here's a link to the source of this info.