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Chain
66 feet or 20m
Breaking chain
Used for climbing slopes to maintain horizontal distance
True North
North Pole
Grid North
North on a projection system
Magnetic North
Determined by the magnetic field; compasses point here
Degrees on compass
360
Minutes on compass
21,600
Seconds on compass
1,296,000
Azimuth
Magnetic declination
What is the most accurate method of aging a tree?
What is the least accurate method of aging a tree?
Basal area
Cross sectional area of a tree at 1.3 m vertical
Hypsometer