Some cannons are less accurate when shooting than others. Cannons with a shorter barrel and/or low muzzle velocity suffer from this.
To represent the drawback, the special rule Inaccurate is noted as the “inaccurate” keyword, followed by a number in parentheses. The number states the penalty to any To Hit roll when shooting this cannon.
Example: inaccurate(-2) would mean that 2 is subtracted from the To Hit score of the tank using the cannon with this notation.