ABSTRACT
If in a period of time t the vessels are in the same position it will mean that ϕg2 =ϕo2, λg2 = λo2. Then taking into account (1), (2) and (2), (4) we can put it as:
In equations (5) we provided the value t with indices “ϕ” and “λ” to indicate the time of vessels’ reach the same latitude and longitude.
