3 - 5 Figure 3-2. STERILE FIRE SUPPORT OVERLAY b. PLOT CR Checklist. Using one of these (Table 3-4) helps ensure the leader’s fire support plan is complete. He uses it in identifying all aspects of individual targets before coordination and the OPORD. Table 3-4. PLOT CR CHECKLIST Purpose Planned indirect fires. Location Plan targets with an 8-digit grid (minimum) Observer-Planned Observer See the impact of the rounds and adjust Trigger Method of initiating fires Communication Method of communicating between observer and the supporting unit Resources Planned allocated resource for each target 3-7. CALL FOR FIRE. Asterisks indicate required elements for a basic call for fire mission. Example call for fire transmissions are shown in Table 3-5. a. Observer’s Identification - Call Signs.** b. Warning Order.** (1) Type of mission. • Adjust fire • Fire for effect • Suppress • Immediate suppression/immediate smoke (2) Size of element to fire for effect. When observer does not specify size element to fire, battalion FDC decides. c. Method of Target Location.**