HIPS and SIPS Module : HIPS and SIPS Editors : Subset Editor : Subset Controls : Tracking layer : 1. Select the Tracking layer in the Subset Control window.
 

1. Select the Tracking layer in the Subset Control window.

The window is refreshed to display the tracking options.

Activate the Subset Snapping check box so that the subset bounding box encloses entire tiles.