Well maybe I'm just weird, but what I call a Fuzzy Navel is a screwdriver with peach schnapps equal to the amount of vodka in it.

epicurious.com agrees with me:
Fuzzy Navel
1 ounce vodka
1 ounce peach schnapps
4 ounces orange juice

Pour all of the ingredients into a highball glass almost filled with ice cubes. Stir well.