There is no difference whether one is deaf or not when tongues are alien to our knowledge and experience. Each form of sign language has developed in its own region related to the greater culture of that region and therefore naturally could not be universal, however visual gestures combined with expressions as an only means of communication together with intelligence, gives the edge to Deaf people in this situation.

Everybody has its own language, Deaf and hearing alike. Common ground might be found in vocabulary and that is about it.

[Quoted from source http://au.answers.yahoo.com/question/index.php?qid=20070424134401AAo8CDe]
Rebecca observed; "I moved from Hawaii to Virginia and even had to change regional signs. It's same as speaking language...regional differences. Move out of one country where others speak another language and there's yet another signed language as well.

To conclude:

	US and Canada; English speech - mainly ASL
	Brittany; English speech - BSL, SEE, CASE etc
	Australia; English speech - AusLan
	Mexico; Spanish speech - LSM
	France; French speech - LSF(langue des signes franaise)
	Germany; German speech - GSL
	South-Africa; English speech - SASL

etc. and all are unique, not even considering regional deviations as Rebecca has experienced.