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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.