Boat stuck the middle of the sea...

[sniperpr1]

Hi, I hope anyone has the answer to my problem. I am travelling far from any land, when suddenly my boat stops mid-course, the telegraph is set at the appropriate speed setting but the speed of the boat goes to 0 and the game says "Cannot comply". Does anyone know how to fix this? It is very annoying trying to complete a patrol and the game getting stuck every few minutes. Thank you...