In its mathematical essence, the task of determining ship’s position coordinates, is to
minimize appropriately defined goal function. This paper proposes to use the method of
conjugate gradient for this purpose. The reason is that calculations may be performed in
some seconds time because Microsoft and Apache implemented the conjugate gradient
method as a tool called the Solver and embedded this tool in their widely offered and
popular spreadsheets, namely Excel and the Open Office Calc, respectively. Further in
this paper it is shown how to precisely assess errors of ship’s position coordinates with
the Monte Carlo method that employs the Solver.