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Universal Linear (P600=11) 
This volume calculation creates a linear approximation of the level/volume 
relationship,  and  works  best  if  the  vessel  has  sharp  angles  between  each 
section. 
     
 
You should enter a level/volume breakpoint for each place where the vessel 
changes direction, and numerous where the section is slightly curved (mostly 
linear, but has got a small arc). You can enter any number of pairs between 2 
and 32. 
Universal Curved (P600=12) 
This volume calculation creates a curved approximation of the level/volume 
relationship, and works best if the vessel is non-linear, and there are no sharp 
angles. 
   
 
You should enter 2 level/volume breakpoints at the minimum and maximum 
levels, and several for each place where the vessel has got an arc. You can 
enter any number of pairs between 2 and 32.