Real Navigation ship's log device.

[CoRb]

Greetings.
Can anybody help me answer my question?
There is a section "Real Nav Auto Fix Patrol" in the Automated Script mod. The script place a Dead Reckoning mark on the map. As I understand it, mark placed from the current position of the submarine. Is it possible to take marks
from the compass course only, like a real ship's log device? As I read about the log device, Navigator doesn't consider drift when plotting Dead reckoning before taking currents and drifts corrections.
It's allow players taking wind corrections by themselves( for more immersion)
So, does somebody know how to attach marks displaying with the compass route only?
We have 3 variables in the equation(passed distance, changed course and time).
Sorry for my English, It's not my native language. I hope you understood what I meant. Maybe this link can explain more(4 paragraph it's about Dead Reckoning Navigation):
http://uboat.net/articles/61.html