THE LAST SEA CHART IS IN THE OCEANS KING TEMPLE. (you only get the sea chart the 5th time you are sent there)
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If you meant on Phantom Hourglass, you close your DS. I knew how to do that when I was 7.
first you need to get the fourth sea chart in the temple of the ocean king. Then go to the island of the dead. Then go to the temple and go the doors in this order, north, east, east, north, north then get the regul necalice and go to the island of ruins.
Northwest sea. Big island with the big mountain separating the wayfarers' side and the other one. Can't miss it.
First click the statue. Next open the southwest sea chart. Then simply comes the DS and the crest is tranfered to your map. Make sure u get the salvage crane cause the crest will lead u in the middle of the ocean. Use the crane to pick up the chest.
You can't find the Old Sea Chart in FireRed.