"Found as loot on creatures and in chests, Resource Maps yield Lumber, Ore, Skins, and Fish. They must be deciphered in the same manner as with Treasure Maps, with a Cartographer. Their skill, coupled with the quality of Spyglass they use, will yield a map of varying degree of accuracy. Your individual Gathering skill (Lumberjacking, Mining, Fishing, Forensics) will determine how close you need to be to the actual gathering spot in order to find it. (Note: Fishing Resource maps will always be land-based, you will not need a boat)."
GrizzlysGhost - Notes/Findings/Random Thoughts Forum Post
Deciphering a Resource Map
Deciphering a Resource Map requires the Cartography skill and a Spyglass
Double-click the Spyglass and target the Resource Map
Spyglasses gain a higher accuracy and success chance when crafted with better quality and materials
Click the gem to begin Deciphering a map
Once it has been deciphered, a map with the estimated location will appear
Locating the Resource
Fishing Map
Base Search Range of 4
Search range increased by (100% * (Fishing Skill / 100))
Lumber Map
Base Search Range of 3
Search range increased by (100% * (Lumberjacking Skill / 100))
Ore Map
Base Search Range of 2
Search range increased by (100% * (Mining Skill / 100))
Skinning Map
Base Search Range of 4
Search range increased by (100% * (Forensic Eval Skill / 100))
Search ranges for all Resource Maps are further improved by using higher quality tools (tool bonuses stack with skill bonuses):
Material
Search Range
Exceptional
+25%
Mastercrafted
+50%
Dull Copper
+30%
Shadow
+40%
Copper
+50%
Bronze
+60%
Gold
+70%
Agapite
+80%
Verite
+90%
Valorite
+100%
Avarite
+110%
Completing a Resource Map
With a deciphered Resource Map in your backpack, travel to the location with the appropriate gathering tool
Use the tool and target yourself to begin harvesting
If you are near the location, a 'camp' will appear
Use the tool and target yourself again to make a tracking arrow appear which will lead directly to the location