you can get it through the temole of the ocean king. You have to complete the 3rd stage of the temple to get it. Try Zelda Dungon or Zeldapedia for a walkthrough if you need it.
Good Luck!
You can't find the Old Sea Chart in FireRed.
Yes,you can find items on mercay island for phantom hourglass,in the temple of the ocean king.You can find the the southwestern sea chart (no requirements),the phantom hourglass,the northwestern sea chart (after you beat the temple of fire for both),the southeastern sea chart and the northeastern sea chart (after you beat the ghost ship for both).
The Coral Sea lies northeast of Australia.
find the sea chart that matches the other sea chart upside down and close the ds. and it will be transferred on your map.
Get to the Northwest Sea Chart and find the Ghost Ship.
put the triforce simbol on that red door and the continue and find it
THE LAST SEA CHART IS IN THE OCEANS KING TEMPLE. (you only get the sea chart the 5th time you are sent there)
The continents that are northeast of Egypt are Asia and Europe. Egypt is located in North Africa, with Asia to its northeast across the Red Sea and Europe to its northeast across the Mediterranean Sea.
You get the last sea chart in the Temple of the Ocean King, B12. You get the last sea chart in the Temple of the Ocean King, B12.
The Red Sea.
coral sea
The 4rth sea chart