From the new USHPA rulebook:

3. 4 National Champions National Championship

Titles shall be awarded and recorded on the USHPA web site.

A pilot's National Champion ranking is based on his/her total NTSS points
accumulated in their best two US "National Championship Event" competitions for
the current year. Titles will be awarded to the top pilot in each of the
following classes as long as at least three pilots compete in the class at a
National Championship Event:

HG - Class 1 - Open, Sport , Single Surface and Women's

HG - Class 2 

HG - Class 5

Pilots attending National Championship Events are encouraged to get an FAI
Sporting License, available from the NAA.