"Navrigate? I never nagrivate! I'm just reminding you that Mom's house is on the left, and if you keep driving so fast you're going to miss the turn! That's not nagrivating! And signal this time! You always forget to signal until it's too late!"
The person sitting next to the driver who is in charge of driving directions, and nagging at the same time.
Cyndi is my nagravator - she is a bit annoying, but she knows how to read a map and knows her left from her right. Linda can't nagravate her way out of a paper bag.