Mobile beacon control algorithm that ensures observability in single range navigation**This work is supported by the European Commission under the FP7–ICT project ”CADDY – Cognitive Autonomous Diving Buddy” (Grant Agreement No. 611373) and ARCHROV project (DPI2014-57746-C3-3-R). Joint results were obtained as a result of staff exchange within H2020–TWINNING project ”EXCELLABUST - Excelling LABUST in Marine Robotics” (Grant Agreement No. 691980). Filip Mandic is financed by the Croatian Science Foundation through the Project for the young researcher career development. | Publicación