For new skippers - the ghost contacts can make thing easier for you to find contacts.
To take advantage of these - you need to keep in mind the following factors.
When a contact FIRST appears on your map and it is close enough for you to reach (100km ish
). Click your sub and drag your waypoint towards the contact. You will see the ghost image move. This shows you where the cantact will be when you get to that way point.
The ghost image is worked out assuming that your speed is standard - this does not change - so if you actually move at another speed - the ghost predictor will not adjust for this.
So how to use this to find ships.
When contact appears on map - click on it and check the time that it was detected. If the time is recent then all is ok.
Next drag your way point and place it ontop of where the ghost contact is.
If you now travel at standard speed - you and the contact will arrive at that spot at the same time.
If you set your speed higher - you will get there first and can then track back along the contact heading or you can wait for it to arrive.
Edit: If the contact is old (checked when you click on it and the time was a few hours) the ghost contact that adjusts does not take this into account. It will move with your waypoint as if it was current.