Select Setup > Sensors > Altimeter.

Auto Cal.

Allows the altimeter to self-calibrate each time you turn on GPS tracking.

Baro. Plot

Variable records changes in elevation while you are moving. Fixed assumes the device is stationary at a fixed elevation. Therefore, the barometric pressure should only change due to weather. Amb. Press. records ambient pressure changes over a period of time.

Elev. Plot

Sets the device to record elevation changes over a period of time or distance.