I'm not sure. I may have been lucky, as the instructors I've had are generally guys who have a significant amount of experience, and in Norway at least, most were guys who had lost their medicals. I have had instructors not familiar with offshore flying, but all have been very receptive to input from guys with extensive experience in the field. As a rule, someone fresh from the sim, new to offshore, for instance, will still be subjected to extensive indoctrination training on the line prior to flying with regular Captains.