Thanks for the advice Mike , I will get one of those brackets .
I put a shower-sap over the GPs now , as only a few drops of petrol went over the gps and over a period of 3 days the gps casing cracked .
However before this incident the gps had ceased up on 3 occassions and luckily one of the party abroad with us was the person who sold me the gps and had witnessed the gps ceasing up .
Therefore we exchanged the gps due to the fault on this basis
Regards
Howie