I also use a Garmin 510, with live tracking that's emailed to my wife. I also discuss/text my intended route(s) prior, and she's pretty familiar with my popular rides, since she's been along for a few of them.

We have also done 'recon' together, on proposed routes while in the car.

I used to ride and commute by motorcycle for many years, so I guess this additional TWO Wheeled addiction is nothing new to her...