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Calibrating the GPSMAP 276Cx 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® 276Cx Outdoor Handheld
- Go to Setup
- Go to Altimeter
- Select Calibrate Altimeter
- 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.