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If one searches the numbers (4 8 15 16 23 42) in coordinates: 4 8 15 162 3 42 in Google Maps, the result is located in the Pacific Ocean near the Marshall Islands.
Once we try a closer look with the satellite mode on, we can see a little island near the spot.
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This is a zoom on the small island which is close to the coordinates at 5°19'02.35" N, 162°57'34.61" E .
A zoom in on the runway on the island shows the number 23.
This island is called Kosrae and it is part of the Federated States of Micronesia.
4 8 15 16 23 42  The coordinates in Google Maps
Kosrae in Wikipedia  Information about the island near the coordinates
While doing coordinates, you must have a chart, sextant, and watch in your inventory. Think of it as the RuneScape equivalent of geocaching. If you don't have those, talk to the professor in the Observatory to get the chart, Brother Kojo at the Clock Tower for the watch, and Murphy at Port Khazard for the sextant (note: You must talk to the professor in the observatory first, you don't need to have completed the observatory quest to get the items but if you start it you must finish it before he lets you claim/reclaim them (If you are reclaiming them you don't need to talk to the professor again unless it's about the chart)). You will also need a spade to dig up the chest.
If you're doing a level 3 scroll, you will be attacked by a powerful NPC so prepare for combat (Note:This applies only to level 3 clues;wizards do not appear on level 2 coordinate clues). If you're in the Wilderness, it will be a Zamorak wizard who can use Flames of Zamorak. If you're in a nonWilderness area, you will be attacked by a much stronger Saradomin Wizard who can use Saradomin Strike and wields a super poisoned Dragon Dagger. If you do not kill the mage before attempting to dig again another mage may appear at which point all mages will need to be killed before digging again (it is not known whether this is intentional). To kill the Saradomin wizard it is recommended that you bring at least one prayer or super restore potion, wear the best dragon hide you can and protect melee while ranging/meleeing it, although the wizard hits harder with magic than melee, and therefore you might need more food. Do whatever works best for you; maging is not recommended due to his high magic defence. You can alternatively wear your best melee defence armour while protecting from magic. Should you chose to do this then you will need to bring an antipoison potion since his melee attacks are extremely likely to poison unless you have some kind of immunity (such as that provided by an antipoison). The best way to kill a Saradomin wizard is to run a small distance away and range him, using Protect from magic, as the wizards cannot move very far from where they appear, thus negating their melee attack. Regardless of your strategy, always bring a oneclick teleport and have fully charged prayer.
Coordinate clues do not appear in level 1 clues, and the wizards will only attack if the player is on a level 3 coordinate clue. The coordinates 0,0 centre at the Observatory. Top of the world (northern Iceberg) is about 30 North, southern Pest Control about 18 South, western Lunar Isle about 12 West, and eastern Mos Le'Harmless about 40 East.
A high resolution RuneScape world map marked with treasure trail coordinates is also available here.
Clue  Shorthand  Description 

00 degrees 00 minutes north, 07 degrees 13 minutes west  00.00 N 07.13 W 

00 degrees 05 minutes south, 01 degrees 13 minutes east  00.05 S 01.13 E 

00 degrees 13 minutes south, 13 degrees 58 minutes east  00.13 S 13.58 E 

00 degrees 18 minutes south, 09 degrees 28 minutes east  00.18 S 09.28 E 

00 degrees 20 minutes south, 23 degrees 15 minutes east  00.20 S 23.15 E 

00 degrees 30 minutes north, 24 degrees 16 minutes east  00.30 N 24.16 E  Slightly northeast of the small hut (that leads to Zanaris) in Lumbridge swamp. Zandar Horfyre offers free transportation to this spot.

00 degrees 31 minutes south, 17 degrees 43 minutes east  00.31 S 17.43 E 

01 degrees 18 minutes south, 14 degrees 15 minutes east  01.18 S 14.15 E 

01 degrees 24 minutes north, 08 degrees 05 minutes west  01.24 N 08.05 W 

01 degrees 26 minutes north, 08 degrees 01 minutes east  01.26 N 08.01 E 

01 degrees 35 minutes south, 07 degrees 28 minutes east  01.35 S 07.28 E 

02 degrees 46 minutes north, 29 degrees 11 minutes east  02.46 N 29.11 E 

02 degrees 48 minutes north, 22 degrees 30 minutes east  02.48 N 22.30 E 

02 degrees 50 minutes north, 06 degrees 20 minutes east  02.50 N 06.20 E 

03 degrees 35 minutes south, 13 degrees 35 minutes east  03.35 S 13.35 E 

03 degrees 45 minutes south, 22 degrees 45 minutes east  03.45 S 22.45 E 

04 degrees 00 minutes south, 12 degrees 46 minutes east  04.00 S 12.46 E 

04 degrees 03 minutes south, 03 degrees 11 minutes east  04.03 S 03.11 E 

04 degrees 05 minutes south, 04 degrees 24 minutes east  04.05 S 04.24 E 

04 degrees 13 minutes north, 12 degrees 45 minutes east  04.13 N 12.45 E 

04 degrees 16 minutes south, 16 degrees 16 minutes east  04.16 S 16.16 E  Outside the east wall of the Ship yard building where G.L.O. Caranock hangs out. A Saradomin wizard will attack.

04 degrees 41 minutes north, 03 degrees 9 minutes west  04.41 N 03.09 W 

05 degrees 20 minutes south, 04 degrees 28 minutes east  05.20 S 04.28 E 

05 degrees 37 minutes north, 31 degrees 15 minutes east  05.37 N 31.15 E 

05 degrees 43 minutes north, 23 degrees 05 minutes east  05.43 N 23.05 E 

05 degrees 50 minutes south, 10 degrees 05 minutes east  05.50 S 10.05 E 

06 degrees 00 minutes south, 21 degrees 48 minutes east  06.00 S 21.48 E 

06 degrees 11 minutes south, 15 degrees 07 minutes east  06.11 S 15.07 E 

06 degrees 31 minutes north, 01 degrees 46 minutes west  06.31 N 01.46 W 

07 degrees 05 minutes north, 30 degrees 56 minutes east  07.05 N 30.56 E 

07 degrees 33 minutes north, 15 degrees 00 minutes east  07.33 N 15.00 E 

07 degrees 43 minutes south, 12 degrees 26 minutes east  07.43 S 12.26 E 

08 degrees 03 minutes north, 31 degrees 16 minutes east  08.03 N 31.16 E 

08 degrees 05 minutes south, 15 degrees 56 minutes east  08.05 S 15.56 E 

08 degrees 26 minutes south, 10 degrees 28 minutes east  08.26 S 10.28 E 

08 degrees 33 minutes north, 01 degrees 39 minutes west  08.33 N 01.39 W 

09 degrees 33 minutes north, 02 degrees 15 minutes east  09.33 N 02.15 E 

09 degrees 48 minutes north, 17 degrees 39 minutes east  09.48 N 17.39 E 

11 degrees 03 minutes north, 31 degrees 20 minutes east  11.03 N 31.20 E 

11 degrees 05 minutes north, 00 degrees 45 minutes west  11.05 N 00.45 W 

11 degrees 41 minutes north, 14 degrees 58 minutes east  11.41 N 14.58 E 

12 degrees 48 minutes north, 20 degrees 20 minutes east  12.48 N 20.20 E 

13 degrees 46 minutes north, 21 degrees 01 minutes east  13.46 N 21.01 E 

14 degrees 54 minutes north, 9 degrees 13 minutes east  14.54 N 09.13 E 

16 degrees 03 minutes north, 14 degrees 07 minutes east  16.03 N 14.07 E 

16 degrees 31 minutes north, 12 degrees 54 minutes east  16.31 N 12.54 E 

16 degrees 35 minutes north, 27 degrees 01 minutes east  16.35 N 27.01 E 

16 degrees 43 minutes north, 19 degrees 13 minutes east  16.43 N 19.13 E 

17 degrees 50 minutes north, 08 degrees 30 minutes east  17.50 N 08.30 E 

18 degrees 3 minutes north, 25 degrees 16 minutes east  18.03 N 25.16 E 

18 degrees 22 minutes north, 16 degrees 33 minutes east  18.22 N 16.33 E 

19 degrees 43 minutes north, 25 degrees 07 minutes east  19.43 N 25.07 E 

20 degrees 05 minutes north, 21 degrees 52 minutes east  20.05 N 21.52 E 

20 degrees 07 minutes north, 18 degrees 33 minutes east  20.07 N 18.33 E 

20 degrees 33 minutes north, 15 degrees 48 minutes east  20.33 N 15.48 E 

21 degrees 24 minutes north, 17 degrees 54 minutes east  21.24 N 17.54 E 

22 degrees 30 minutes north, 03 degrees 01 minutes east  22.30 N 03.01 E 

22 degrees 35 minutes north, 19 degrees 18 minutes east  22.35 N 19.18 E 

22 degrees 45 minutes north, 26 degrees 33 minutes east  22.45 N 26.33 E 

24 degrees 24 minutes north, 26 degrees 24 minutes east  24.24 N 26.24 E 

24 degrees 56 minutes north, 22 degrees 28 minutes east  24.56 N 22.28 E 

24 degrees 58 minutes north, 18 degrees 43 minutes east  24.58 N 18.43 E 

25 degrees 03 minutes north, 17 degrees 05 minutes east  25.03 N 17.05 E 

25 degrees 03 minutes north, 23 degrees 24 minutes east  25.03 N 23.24 E 

Anagrams • Challenge scrolls • Simple clues • Cryptics • Emote clues • Coordinates (Locate) • Maps • Puzzle boxes (guide) 
All maps in City of Heroes and City of Villains use a coordinate system to track where people and objects are. These coordinates are all in the form of an (x, y, z) triplet. The coordinates are in units of ingame feet. For example, the point at coordinates (1, 0, 0) is one ingame foot away from coordinates (0, 0, 0).
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The coordinates are slightly odd in that they do not follow a traditional mapping system. The xaxis is the eastwest axis on game maps. However, as one travels east (right), the xcoordinate decreases. The yaxis is the vertical location of a person or object and increases as one increases one's altitude. The zaxis is the northsouth axis on game maps, and increases as one travels south (down). Notice that coordinates can be positive or negative.
The axes are summarized in the diagram below, a modified map of The Hollows:
The origin of the maps (coordinates (0, 0, 0)) vary from map to map, and in some cases, is off the primary map area entirely.
Internally, the game tracks coordinates to six decimal places, or +/ 0.000001 feet (0.000012 inches). This is a high degree of accuracy, usually a degree that is not needed for practical purposes.
The simplest way to obtain one's coordinate is to type /loc on the chat command line. This will show one's coordinates on a map accurate to within 0.1 feet (1.2 inches).
If the /loc command will be used often, it might be useful to bind the command to a key. For example, if the L key is not being used in some other capacity, typing the following on the chat command line will allow a player to simply press the L key to gather his or her location:
/bind L "loc"
If a higher degree of accuracy is desired, the full six decimal places of coordinates are recorded in demorecord files. To create a demorecord file, type /demorecord filename on the chat command line. The file will be saved in a subdirectory of the City of Heroes application directory (C:\Program Files\City of Heroes by default) named client_demos. To stop the demorecord file, type /demostop on the chat command line. For simple coordinategathering, the demostop command can usually be issued immediately after the demorecord command.
Once the demorecord file is created, open it using a text editor and search for the character's or object's name you wish to get the coordinates of. The name should be contained on a line such as the following:
0 32 NEW "DJ Zero"
The second number in this line (32 in the example) is the identification number of the character or object. All coordinates related to this character or object will be contained on similar lines with this identification number, but with the POS command instead of NEW. For example, the following line may appear in a demorecord file with the previous example line in it:
0 32 POS 80.09375 23.0625 1057.03125
The numbers following the POS command are the x, y, and zcoordinates of the character or object. In this example, DJ Zero is located at coordinates (80.093750, 23.062500, 1,057.031250). The /loc command rounds these coordinates to the nearest tenth, so in the game, this would appear as (80.1, 23.1, 1057.0).
