I use the Pi UPS out of Germany. When it detects a power loss, it acts like a UPS and sends a safe shutdown signal to your Pi. Given you're building a GPS for the car, check out Black Box Pi. I've built an open source black box for the car using a Pi that logs GPS, OBD2, and more. http://www.blackbo...

That's pretty nice. Do you have a writeup of how you put it all together?

I've been using different brands and quality levels for a year now and never had a problem so far. And this is in production systems. For those though, I tend to go for something that's at least name brand. For any other application, just get the cheapest cards you can get; aside from some shady fly...

That's a weekend project I could get behind. Nice.

I'm working on a project to build a black box for my car using a Pi and various sensors (GPS, OBD2, dash cam, etc). So similar to your issue, it has to be running in the background when the car's on, but shut off when the car suddenly kills the Pi's power. Here's the solution I found. The Pi UPS: ht...