Sisbak mortir is a system that quicken the Firing calculation. to explain this systems, we divide to three units;(1)Jaupan or Field Observer, then (2) Pusturbak or Fire Direction Center, and (3)Pucuk or Gunner. Jaupan will capture the target with digital binocular then send the data to Pusturbak through CCU (Computer Control Unit), Pusturbak will decide the type of ammunition, and decide which Pucuk/mortar that wil do firing. The user on Pucuk then adjust the azimuth and elevation based on Pucuk’s display, this process only took about 60 seconds, compared to the convensional method (using Morcos), it takes about 15 minutes, risking the enemy can moved from their first position.