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Calibrating the GPSMAP 64s/st/sc Barometric Altimeter

With proper calibration, barometric altimeters will report elevations ranging from -2,000 to 30,000 feet within +/- 50 feet1. The barometric altimeter may calculate values beyond 30,000 feet, but these values may not be accurate.

Always calibrate the altimeter outdoors with a clear view of the sky. 

Calibrating the GPSMAP 64s/st/sc

  1. Open the Main Menu
  2. Select Setup
  3. Select Altimeter
  4. Select Calibrate Altimeter
  5. Follow the onscreen prompts to complete calibration

Note: Garmin's outdoor devices are designed as recreational GPS devices, as an aid to navigation. They should not be used for any activity requiring precise measurements, such as surveying or weather prediction.

1 While calibrating to a known elevation can be accurate to +/-50 feet, calibration by GPS is accurate to +/-400 feet. 

For more information on barometric altimeter accuracy and proper calibration, see the Related FAQ. 

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