Grandmaster cartography guide

Overview
The cartography titles are gained per character by exploring the primary map of each continent. Any area viewable when viewing the world map counts towards the title. This includes the following:
 * Explorable areas
 * Mission zones (cooperative, challenge, and competitive)
 * Arenas not on the Battle Isles
 * Towns and Outposts including exclusive areas for Canthan outposts.

It does not include any area that does not show on the world map of either continent. This includes the following:
 * In Tyria:
 * The Dragon's Lair mission area
 * Pre-Searing Ascalon (this area has its own explorable map)
 * Ruins of the Tomb of the Primeval Kings
 * Sorrow's Furnace
 * In Cantha:
 * Dragon's Throat (Mission)
 * The Undercity
 * Elite Missions
 * Core areas: Any area that appears on The Battle Isles or shows the Battle Isles map, this includes:
 * The Battle Isles themselves.
 * The Fissure of Woe
 * The Underworld

To gain the Grandmaster Cartographer title, a character does not need to explore every single point on the map. Some margin of error is allowed. As a result, even though some characters may never be able to access some portions of the map, they may still earn 100% explored. Unreachable zones would most likely be arenas that have been rendered inaccessible due to a game update (such as Fort Koga) or due to level limits (such as the Shing Jea Arena) but may also be training areas for characters local to the continent (such as Monastery Overlook). Again, these zones do count towards those who revealed them, but they do not make it impossible for those who cannot to obtain the grandmaster title.

The Maps
Check out the Maps section in this wiki for general maps of Cantha and Tyria. If stumped, search online for maps posted by those who have reached grandmaster. Compare them with yours to fine detail for differences along edges. Using an image editor (such as Photoshop for example) can greatly help in revealing missing areas when comparing maps. Some related forums may provide support to help look.

The Math
A fully explored area equal to the size of the radar around a player equals roughly 0.1% of Cantha. The percentage is less for Tyria (about 0.07%) as it is a larger continent.

Exploration Tips

 * Scrape! Working towards the grandmaster cartographer title will most likely require you to revisit every explorable area on the continent. Small, trivial regions of map can be revealed by 'scraping' (hugging the outside wall of) the area. While scraping, be mindful of two factors:
 * It adds up: While each of these regions may seem small and insignificant, they easily add up to entire percentages towards the title. Scraping the outside wall of an area you have not scraped before will produce 0.1 to 0.2% even though it may not actually reveal any fog on the map.
 * Go slow: It's better to scrape using the keyboard and walking into the wall all along the edge. While this is slower than simply clicking, it will add more value to the, rather boring, scraping process. Another reason for this is server delay. Sometimes quickly stepping into and out of a spot will not register with the server because of a slight lag.
 * Don't miss Missions. Mission explorable areas usually have a lot of space that players miss due to a few factors:
 * Time: Some missions require players to race against time to complete an objective. This causes most parties to just rush through the mission area and not explore it.
 * Unlocking: Events in missions may often open up areas previously inaccessible. Keep track of opening doors and dropping bridges.
 * Stand-offs: Some missions require that the party holds out against a siege to protect an NPC. Such missions will usually have explorable areas outside the siege area that players will not be capable of exploring while the siege is taking place.
 * Do not neglect towns and outposts. Some areas of the map can only be revealed by scraping the edges of larger towns, outposts, and mission heads. Often, large portions of the map may be uncovered by exploring an empty but accessible part of a town.
 * Running skills may greatly expediate the mapping process, as it takes much longer to fight everything that comes across your path compared to running past it. However, running in and out of a nook quickly may not register properly with the server.

The Nooks and the Crannies
These are specific areas commonly missed by cartographers.

Tyria

 * The Great Northern Wall: After the timer starts in the final part of the mission, the entire Charr camp can be explored. The western road from which Charr come at you while approaching the bridge can also be used to reveal all the map between the mission area and Piken Square. While the timer may not allow enough time to fully explore the western road, there is an exploit players can use to reach the area without setting off the timer. Change your character's secondary profession to a Necromancer if needed and bring a corpse teleportation skill (such as Necrotic Traversal or Consume Corpse). Near the overlook of the Charr camp, there should be a Charr boss who patrols nearby. Position the boss underneath the bridge and kill it. Using the one of the necromancer skills previously mentioned teleports you to the corpse but warps you to the bridge above. This way you are able to skip the cutscene that triggers the timer countdown and explore at your leisure.
 * The Frost Gate: You can use either of the necromancer skills Necrotic Traversal or Consume Corpse to reach the road used by Rurik. This requires either 1) pulling an ice golem to kill one of Rurik's guards, 2) killing a snow wolf near a bridge around where the bonus is to provide a corpse to teleport to, or 3) killing the Ettins beneath the small bridge within the ice cave itself to provide a teleportation corpse. Watch out, as towards the end, an ever-growing series of spawns appears (that usually kill off Rurik if you take too long at the end of the mission). Also during the end of the mission, a door opens up allowing access to the southeastern corner of the mission area.
 * Lion's Arch: The southern tip of the city can reveal some of the coastline (some players think it's part of the Gates of Kryta mission.
 * The Wilds: Northeast (where the bonus takes place by the lake) and northwest are spots missed by many players.
 * Bloodstone Fen: Run past Justiciar Hablion and his group to explore a small area past them.
 * Aurora Glade: Avoid tuning all three of the crystals while you fight off the White Mantle until you have completely explored the area east of the portal. There is a path past the right most gate that can be used to sneak behind the White Mantle forces.
 * Henge of Denravi: The western and northern edges of the city can reveal some map.
 * Sanctum Cay: The groups that come after Vizier Khilbron at the end of the mission come from exporable but densely populated shorelines. Stay as far from the dock as possible to delay furthering the mission to explore these areas.
 * The Amnoon Oasis: The coastline of the city can be explored.
 * Dunes of Despair: One of the trickier missions to explore. You will likely need a friend to stay with the Ghostly Hero along with henchmen to keep him alive while you explore. Or you can try avoiding the enemy ghost and using necrotic traversal to jump across the nothern bridge. There are three enemy bases to explore at the southern end of the map, the western one will have a draw bridge drawn up. You can still walk through it. In addition, there is a very large area to explore east of the eastern most base accessible through a tight tunnel slightly north of the southeastern base. Beware of the large number of Jade Scarabs that crawl out of the ground.
 * Talus Chute: The northeastern corner of the area can be explored by climbing hills along the eastern edge between the Icedome and Ice Caves of Sorrow.
 * Thunderhead Keep: Delay talking to the king at the end of the mission to explore the area outisde the keep. Also, there is a path to the east from the beginning that is infested with Avicara.
 * Hell's Precipice: The cinematics in the mission will cause the party to skip some areas of the map. Backtrack to reveal them.

Cantha

 * Zen Daijun (Explorable): Some doors will be open which were closed during the mission.
 * Kaineng Center: There are stairs down to the long pier along the western side of the city.
 * Vizunah Square: This is the only mission that does not offer a matching explorable area. You will need to scrape the mission while doing it. Also, try to gain access to the other starting point to scrape there too. Canthan-born characters can accompany foreign born characters in doing the quest Welcome to Cantha to access Vizunah Square (Foreign Quarter) and foreign characters can accompany Canthan-born characters in doing Mayhem in the Market to access Vizunah Square (Local Quarter).
 * Tahnnakai Temple (Explorable) has a large northern region open for the exploration that is inaccessible during the mission.
 * All the Challenge Missions except Dragon's Throat allow you to explore small amounts of the map inaccessible by the surrounding zones.
 * Don't forget to scrape the edges when banished during the Imperial Sanctum mission.
 * A small portion of Shing Jea Monestery surounding the training arena could only be explored during the Dragon Festival games. The arena itself could also be explored during the festival for non-Canthan players who played the dragon tag game.