Profession: Electronic engineer
The most common implant I see is the finger magnet. I understand why. It's small and simple put provides a whole new sense just by virtue of being inside your body. Small intrusion and big gain.
The most common topic I see for new implant types are about electronics. I understand why. We understand them and can program them to do amazing things. Transferring data and power are clearly a serious hurdle though.
I propose we take a step back and think about what we can do without electronics. This is counterintuitive to my job title.
The compass is a logical place to start because it's an old technology that relies on simple components; a magnet and something for it to spin on.
All the brainstorming I've seen for a Southpaw involves implanting powered components which makes sense given that the Northpaw is a rugged assembly of electronics. However, I think this is only the first approach.
Think about old watches for a moment. Gears. Springs. Pendulums. Mechanics on a miniature scale and built to last decades. Any antique store has watches older than your grandparents.
A purely mechanical compass implant is not beyond the brainpower of the people reading this. We live with 3D printers and laser cutters. Not only can we conceive and build this device but we can do it quickly and without sponsorship.