My bodybugg says I burned 1186 calories?!

Can this be right?! I walked briskly, and part of it was uphill, for 2 hours. I've had the bodybugg for two years and it always seems to be pretty accurate but I'm having a hard time believing I burned that many calories! Yesterday I walked for the same amount of time but on a totally flat route and it said I burned around 750 calories in the same time.

Anyone use the bodybugg? Does this sound accurate?