YAPS is an open source alternative to estimate tracks of aquatic animals tagged with acoustic transmitters. The original version of YAPS was presented in Baktoft, Gjelland, Økland & Thygesen (2017): Positioning of aquatic animals based on time-of-arrival and random walk models using YAPS (Yet Another Positioning Solver). Since then, we have worked on improving the code, adding more features and adding examples and tutorials to help users implementing YAPS in their studies.
Have a look at the step-by-step guides found under Articles for a quick intro to hands-on working with YAPS.