For those that have never used a map and compass, I would suggest taking a short course on it or take time to learn from those that have done it for sometime.
I remember the 1st navigation lesson I ever taught (how to perform a resection - 2nd hardest lesson in nav to teach) which was basically how to locate your position with no friggen idea where you are, easy enough to once you learnt all the previous parts for nav.
if you are going places where you think there is a possibility of getting lost, as others have said, ensure you have the right gear for where you are goin ie shelter, water, food etc, let people know your movements, look at making up a survival kit or purchase a pre-made 1 and ensure it is upto the task.
I am not part of the SES at this stage but the old man is in the hills and has been in numerous searches and a lot of the causes are the most simplest things that people will always over look.