The article is devoted to development of algorithms for the onboard indication equipment of the modern anthropocentric objects (manned aircraft, manned submersibles, various vehicles and technical systems with operators) using mathematical and hardware-in-the-loop (HIL) scaled-down simulation involving professional operators. The paper demonstrates feasibility of creation of mathematical models (MM) of operator's work in typical combat situations (TC-s) of anthropocentric objects' operating cycle. For each TC its own MM is developed. It consists of two blocks: the onboard algorithm simulation unit (SOA), supplying the determined TC-s information to the information and control field (ICF) of the anthropocentric object cabin and situational control unit (SCU), simulating operator's activity algorithms using only the available current TCS information on ICF and the controls available on it. Anthropocentric object includes such physical systems as onboard measuring systems, onboard executive systems, crewmembers and ICF. The crew is the main element of such a system, and for it SCU is developing. The work describes the joint development procedures in TC: a) operator decision graph (ODG) and onboard algorithms scheme (OAS); b) SOA and SCU based on ODG and OAS. Performance of the proposed approach is demonstrated on the example of the anthropocentric object of F-I6M3 Fighter.