The Crandor map is one of the items needed to complete the quest Dragon Slayer. It is vital to the sailor Ned for him to sail the player to Crandor.
The Crandor map is made after collecting the three map parts and using any one piece of the map with another, provided that the player has all three parts in his or her inventory.
To obtain an extra map for memorial purposes, one should do the following:
Prepare two sets of Telekinetic Grab runes (2 laws, 2 air) and with 33 Magic (boost from Mind bomb accepted) to obtain two maps from Wormbrain. Players should kill Wormbrain once and get hold of the map for several minutes, until they can attack him again, but firstly drop their piece and grab the second, or it will not be attackable.
Players don't need double items for obtaining other double map parts, just drop the first and grab the second, then pick the first one as well.
Combining the map is an important part. Never place a map in bank if players are combining another map. Instead, once all the six pieces are in inventory, drop three of them and combine the others. Then pick up the three pieces and drop the map. Combine and pick up the combined map.
Before giving one of the map to Ned, it isn't safe yet. Just drop a map and bring another to Ned. Then pick up the dropped one and do not talk to Ned again. Bank the map or keep the map in inventory (if they're sure they won't die) and go to Klarense's Lady Lumbridge, and go fight Elvarg.
If a player manages to keep the map and take it to the Wise Old Man, he will offer to buy it for the price of 3 coins.