Forces on sails apart, which generally prevents heeling. Each sailing craft is a system that mobilizes wind force through its sails—supported by spars and rigging—which provide motive power and reactive force from the underbody of a sailboat—including the keel, centerboard, rudder or other underwater foils—or the running gear of an ice boat or land craft, which allows it to be kept on a course. Without the ability to mobilize reactive forces in directions different from the wind direction, a craft would simply be adrift before the wind. Accordingly, motive and heeling forces on sailing craft are either "components of" or "reactions to" the
MESO-SAILS SAILS many times: MESO-SAILS (Multiple Elevation Scan Option for SAILS). These additional supplemental low-level elevation scans are evenly spaced, in time (as close as possible given the defined VCP rotation rates), throughout the volume scan. The radar operator may choose 1 to 3 extra scans, depending on the weather situation. This lengthens the time of the total scan but provide low level coverage more often. During the Summer of 2013, the Radar Operations Center, in order to facilitate "Proof of Concept" testing of MESO-SAILS, defined two VCPs that were based on VCP-12 that included hardcoded additional low-level split-cut scans. For