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What do all good orienteering compasses have?
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Step 1:
I'll solve this problem by breaking down the key components of a good orienteering compass:

Step 2:
: Baseplate

A good orienteering compass must have a clear, transparent baseplate. This allows the user to: - Lay the compass directly on a map - Align map edges and compass lines - See map features through the baseplate

Step 3:
: Rotating Bezel (Degree Ring)

The compass should have a rotating bezel with: - Clearly marked degrees (0 - 360°) - Precise increments (typically in 2° or 5° intervals) - Allows accurate navigation and bearing measurement

Step 4:
: Magnetic Needle

An essential feature is a high-quality magnetic needle that: - Moves freely and quickly - Is colored (typically red/white) - Points consistently to magnetic north - Has minimal magnetic deviation

Step 5:
: Declination Adjustment

Advanced orienteering compasses include a declination adjustment mechanism to: - Compensate for difference between magnetic and true north - Allow precise navigation in different geographic regions

Step 6:
: Sighting Mirror

A good compass often includes a sighting mirror to: - Improve accuracy of bearing measurements - Allow precise alignment with distant landmarks - Provide backup signaling capability in emergencies

Final Answer

A good orienteering compass has a transparent baseplate, rotating degree bezel, sensitive magnetic needle, declination adjustment, and preferably a sighting mirror.