Displaying data associated with drilling a borehole. At least some of the illustrative embodiments are methods including: reading data associated with drilling of a first borehole, at least one datum of the data based on a controllable parameter; calculating an operational value related to drilling the first borehole, the calculating in real-time with reading the data and the operational value based on the data; determining a target value of the operational value, the determining in real-time with reading the data and the target value at least in part based on the data; displaying a first borehole trajectory on a display device; superimposing a first coordinate system over the first borehole trajectory on the display device, the superimposing proximate to a distal end of the first borehole trajectory; and plotting, within the first coordinate system, an indication of the operational value and an indication of the target value.