Garmin Nuvi 370 = "Garwoman"
Our game, when she is in on-road mode getting us near a cache or for "real" navigation, is to add "you idiot" to the end of her instruction. (Sort of like "in bed" at the end of a fortune cookie futune).
Garwoman, "In .3 miles, turn left..."
Car-full-of-cachers in unison, "..YOU IDIOT!"
This works especially well when Garwoman intones, "recalculating, recalculating..." Some will envariably add the unspoken narrative going on in Garwoman's head, "...as I am ALWAYS doing for you! If you would simply turn when I TELL you to turn, we wouldn't be in this mess! Which reminds me...this car is TRASHED! Will you ever throw away your own McDonald's wrappers? There are 20 yr old french frys under your seat!!..."
(Yes, it was a VERY long road-trip filled summer for two adults and two kids!!)