International driving permit - required or not?

[deeve007]

Hey folks,

Was having a discussion with someone who plans to do a bit of overland driving in South America, and they were adamant that an International Driving Permit was required to do so and that not to have one was foolish. I am of the opinion it's a "nice to have" thing - a little like a scarf on a cold day - but not much else. But was curious what the prevailing opinion/experiences was on Hubb from those who have actually done this more recently and/or more extensively?

Cheers.