There is another device from Aqwary that has similar functionality (relative location vs. GPS). I have to admit that, for the most part this seems like a solution looking for a problem. I think the technology peaked at the compass with a 20 degree tilt. Having said that... when they can fit this functionality in my existing dive computer (hint hint... license deal...) then I’d probably opt in but as an add on device... nah I’m good thanks.