Participants were encouraged to use these "official" meshes, if possible, in order to eliminate grid variation effects in comparisons of results from experiments and other participants.

The angle between magnetic and grid meridians is called grid magnetic angle, grid variation, or grivation.

It should be noted that the Oct 2001 grid availability was extremely poor and that erratic grid conditions are known to cause turbine trips associated with grid variations.

MODFLOW-USG was initially released in 2013, which is designed to adapted to a wide range of grid variations using unstructured grids.

If a magnetic compass is used to follow the grid direction then the corrections of variation and convergency can be combined to a single correction called grid variation or grivation.

But, they are nevertheless encouraged to also perform and provide solutions on the grids provided, if feasible, so as to eliminate the effects of grid variations in the comparison of results from different participants.

Further, it should be noted that when the turbine faults off due to grid variations then it probably is true that EWC is penalized for the grid variations.

The angle between magnetic and grid meridians is called grid magnetic angle, grid variation, or grivation.

If a magnetic compass is used to follow the grid direction then the corrections of variation and convergency can be combined to a single correction called grid variation or grivation.