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potentially explosive atmosphere. Obey all signs and instructions. Sparks in such areas could 
cause an explosion or fire, resulting in bodily injury or death. 
Areas  with  a  potentially  explosive  atmosphere  are  often  but  not  always  clearly  marked. 
They include: 
"  fuelling areas such as gas or petrol stations 
"  below deck on boats 
"  transfer or storage facilities for fuel or chemicals 
"  vehicles using liquefied petroleum gas, such as propane or butane 
"  areas when the air contains chemicals or particles such as grain, dust or metal powders 
"  avoid using the modem in areas that emit electromagnetic waves or enclosed metallic 
structures e.g. lifts or any other area where you would normally be advised to turn off 
your engine