Sources of Error

• Noise errors: ± 3 meters

• Bias errors: S/A (Selective Availability), ᡖ meters; atmospheric dynamics (±10 meters); ionospheric aberrations (᝺ meters); tropospheric variability (ə meter); clock inaccuracies (ə meter); multipath, etc. (ə meter)

• Blunders: ouch!

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