Garmin Ltd.

Spending: Make your car smarter

The latest automotive technologies can activate the brakes if you're about to crash, warn you when a car is in your blind spot and even guide you into a parallel parking space. But what if you're not ready to spring for a new ride? Can you pick up features like these in the aftermarket? We found a few add-ons worth considering, and one we'd give a pass.

Backup camera

Rearview cameras help drivers avoid collisions when backing up (they'll be required on all new cars sold by May 2018), and they make parallel parking a whole lot easier.

Like many aftermarket cameras, the EchoMaster MRC-LP01CP ($200, plus $200 for installation) comes built into a frame that easily bolts onto...