Because of the large expenditure in effort and materials required to build a DFP, it is important to ensure that the DFP is correctly sited. In order to site the DFP, the officer in charge ("OIC") should view the ground from the same level that the intended user's weapons will be sighted from. Normally, the OIC will need to lie on his belly to obtain the required perspective. This ensures that the position will be able to cover the desired sector.