Are the cursor measurement values calculated+ or referenced to the display? What are the advantages and disadvantages of using cursors?

Are the cursor measurement values calculated+ or referenced to the display? What are the advantages and disadvantages of using cursors?

Cursor measurements are usually referenced to the display and have display resolution. If you use zoom, the values can be interpolated from the acquired data and will have the zoomed display resolution. Cursors allow you to make special or arbitrary measurements but rely on human accuracy for placement.