The briefing tells you how best to make the dive, but sometimes the current changes during your dive and it is difficult, uncomfortable or even dangerous to stick to the plan. In that case you can of course always change the plan and go in the other direction. However, be aware that the crew monitoring the dive from above and expects you to surface somewhere. If you change the dive plan during the dive and you go completely in a different direction, make yourself well visible by launching a buoy (SMB). This way the crew knows where you are, you avoid unnecessary waiting at the end of your dive and you know for sure that they can find you.