Homeworld Effects Manual: setDeltaLOF()
setDeltaLOF(float value)
Offsets object's position by value meters in Z direction.
Default value: 0
Legal values: all real numbers
This command is a bit odd. It's got 'delta' in its name, but it does not set up a rate of change. TO give objects speeds along various axes, use commands that start with setVel. LOF (Line Of Fire, as near as I can tell) corresponds to the Z axis. See the figure below to see exactly where the LOF axis goes. setDeltaLOF() offsets an object along this axis by value meters.