120 miles is quite some going.

It is very common for people to panic and take to their feet once they realise they are lost.

If in that situation it is important to stop once you realise you are lost and calm your panic. In most cases it is best to stay put and wait for rescue rather than try and walkout. If you have left a trip report with someone, once you are late back they will raise the alarm and help will be on its way to you.