Honeywell Bendix/King KMD 550 Pilot's Manual Addendum page 13

The following figure shows the Terrain Display color patterns when the
aircraft is at higher altitudes, where terrain is a least 250 feet below the
aircraft altitude for the display range selected by the pilot.
The system will adjust colors on the Terrain Display automatically as the
aircraft altitude changes. The Terrain Display also transitions between
the lower altitude "relative" display and the higher altitude "peaks" display
automatically, so no pilot action is required for system operation.
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Rev 2 September/2001 KMD 550/850 Terrain Addendum