%0 Journal Article %A Kos, Serđo %A Brčic, David %T Approximation Models of Orthodromic Navigation %J TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation %V 5 %N 4 %P 519-526 %D 2011 %U ./Article_Approximation_Models_of_Orthodromic_Kos,20,323.html %X The paper deals with two different approaches to orthodromic navigation approximation, the secant method and the tangent method. Two ways of determination of orthodromic interposition coordinates will be presented with the secant method. In the second, tangent method unit change of orthodromic course (?K) will be used. %@ 2083-6473