in the temple of the ocean king (ps oshus is the ocean king)
it is found out of the game but you can go to gamewinners.com to find out where to get the seachart.
either an hourglass or a triforce.hope it helped.:)
You have to get the last seachart that huge island on the chart that's the cobble kingdom
go to the very last floor in the temple of the ocean king
well supposing you have the wood heart he will be sailing around in the southwestern seachart
you have to get the northeastern seachart that's how to go to that place
he is in the northwestern seachart in the center of the map near the top and west of banan island
go to the temple of the ocean king and draw a triforce instead of an hourglass and the get thenortheastern seachart
On the south western seachart right by molinda island you will see three stones. in the middle is spirit isle. Go there with ten gems and you can power up your spirits.
There is one in the middle of the three rocks on the lower left hand corner. (south west seachart) sprit island There Are two on the north west seachart. one is in the corner of the rock wall one is up north towards the middle. whale island and zauz island There are two on the south eats chart. its right of goron island. the other one is just above the 3 rocks in between the two rock walls, or far left from isle of frost. Dee ess and harrow island !:)
Close the ds and then open it again. the crest is then on your map. I dint talk about turning the power off!
Well You get it in the courage temple on Molida island in the starting seachart (south west) and you find the secret hideout of the boys dad and then go through the tunnel to the back and shine all the stone heads light at the door then enter!!! Phew did you get all that???