Hi Steve,Hi Gavin,and HI to all.
Gavin, one of the main things that Steve didn`t mention in his list, is the danger that can present itself in the bush, or a river/creek situation, is that if you are wearing headphones ( as a good detectorist should) then you must always be VISUALLY aware of your immediate suroundings as it is extremely easy to arse over/down something whilst you are engaged in heavily concentrating on what you are doing.
Cheers---Criticol.