It's sort of half way between Southampton and Portsmouth. Just off J9/J11 of the M27.
http://maps.google.co.uk/maps?f=q&source=s_q&hl=en&geocode=&q=Fareham&sll=50.851453,-1.179016&sspn=0.103173,0.3368&ie=UTF8&hq=&hnear=Fareham,+Hampshire,+United+Kingdom&z=12