slope control
The controls generally operate independently but can be operated as a group by holding down the 'Ctrl' key when a snap/accept or accept is performed.
On the bearing control, if the 'Ctrl' key is held down during a snap/accept, the distance control is set. If last control is a slope control and if applicable, this is also set as well. The function acts as if you performed a snap/accept or accept in each of the three controls simultaneously.
On the second co-ordinate difference control, if the 'Ctrl' key is held down during a snap/accept, if the next control is a slope control and if applicable, this control is set as well. The function acts as if you performed a snap/accept or accept in control simultaneously.