Elevation
If you switch the Show Tracker control to Always in Options > Work Environment > Tracker and Coordinate Input, then the Tracker’s Z field will display elevation values even if input is not yet underway; just move the cursor to get feedback.
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or one of the two optional Reference Levels defined in Options > Project Preferences > Reference Levels.
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2.
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Go to the Elevation Value Origin sub-menu.
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Define Reference Levels at Options > Project Preferences > Reference Levels.