The Equipment Committee's conditions required tangent sights (i.e. direct fire) with the option of a telescope. However, the 18-pounder entered service with rocking bar (also called "bar and drum") sights – open sights with the option of a telescope on the left and a range scale (in yards) on the right of the cradle. These arrangements also incorporated independent line of sight, meaning that the sights could remain laid on the target while the barrel was elevated or depressed. A clinometer was provided for indirect fire when the sight was aimed using a gun-arc (a refined version of the expedient devices used in South Africa) and aiming posts in line horizontally with the target.