At one stage I considered connecting a webcam to an android phone vio OTP and a USB power pack - many phones do support up to 1TB SD cards now, but waterproofing was tricky and adding mounts etc. were at odds against my laziness. For low light conditions, some of the newer phones are much better than GoPros - you'll have to make sure that the waterproof GoPro case remains waterproof, after you cut an aperture for USB power. They're great cameras with image stabilisation, but I wanted a camera at a cheap and worry free crash-disposable price capable of capturing numberplates, at the very least during the day. At night, it's pretty useless for capturing numberplates, even when exposure is ramped up. And at 4k, that doesn't improve much (I usually stick with 1080p, otherwise I'd have to keep stopping to swap memory cards - 64mb limit) because it looks upscaled rather than native 4K, and it doesn't have IS so I shoot at 60fps for clearer exports of video stills. The batteries are cheap, you get two and they last a couple of hours each at 1080p. Cheap standalone chargers and extra batteries are available, with USB charge input, or were at the time. It'll do until some phone/action camera camera becomes available at a reasonable price, capable of all that you've mentioned out of the box. I suspect I'll be waiting a long time... For much longer journeys than I currently make, I could cut a hole out of the waterproof case for USB power input, but then there's the 64GB SD card limit, which I'd have to stop to swap anyway, so I may as well keep the case fully waterproof and swap batteries at the same time, for now. The Crosstour 4k does have a webcam fuction, so it's possible that I could connect it via USB>OTP to an android phone, for both power and video storage, with the phone connected to USB power pack - but I believe that resolution is then limited to 720P (could be a USB bandwidth limitation, unsure, haven't tried USB2). Mounting it to the helmet jawguard reduces many a jitter. Of course aother possibility is the Crosstour 4k as a webcam connected to Raspberry Pi containing a huge SSD.