Enums.EncDisplayDepthUnits enumeration

Change the unit of depth for soundings and contours.

The EncDisplayDepthUnits can be one of:

Constant	Description
`Enums.EncDisplayDepthUnitsMeters`	`(1)` Meters.
`Enums.EncDisplayDepthUnitsFeet`	`(2)` Feet.
`Enums.EncDisplayDepthUnitsFathoms`	`(3)` Fathoms.