In this tech-saturated world, few things are more annoying than car navigation systems that yell at you for making a wrong turn.

"Re-CALC-ulating," the system says in that condescending robot voice, as if it is offended by having to rethink the route.

"Turn left at ... [sigh] ... recalculating ..."

Such interactions lead people to think GPS devices are nagging them, said Mark Gretton, chief technology officer of TomTom, a GPS maker.

"The main interaction you have with the device is a series of commands, so that starts the tone of the relationship right from the start," he said. "It's 'Do this, do that, turn right.' " And it doesn't help if the computer sounds snippy, he said.

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