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How can I offset the altitude to show zero feet/meters at my current location?

Push the front button to change the camera mode until you see the setup screen (gears or wrench), then push and hold the top select button until the top LED starts flashing red then release the button.  The altitude is now set to zero and the offset from mean sea level (the universal reference as zero altitude) is saved on your memory card in the file named “alt_offset.txt”.