I've just posted a couple more videos from my Navman MiVUE630 on this thread...
https://www.landyzone.co.uk/land-rover/freeander-social-s-t-type-faceache-tweets-thread.292809/page-11#post-4119067
The quality of the video that the dashcam takes is very good. It gets reduced a lot when I upload to YouTube. I've got it better by saving the video into a different codec/format before uploading, but still nowhere near great.
The MiVUE Manager software that Navman supply with the camera for playback is pretty basic. There's no editing and no map showing the route. I've been hunting around and found a great bit of software called "Registrator Viewer". I haven't a clue why its called that, but its a great bit of software. It has the ability to group all the 3 minute segments 'into 1' and plot the route on a map. A pointer on the map follows the video and you can move the pointer which also changes the video position. Below the video it graphs the GPS data such as speed, altitude, G force etc. You can put selection start and end points then save that selection as a new segment video/gps file. The grouped segments, which may be complete or your newly created selection segment can be saved into a contiguous file for viewing in standard movie players, uploading etc. Best bit about it is it is extremely fast - it apears very light on processing power.
Unfortunately it sounds like the creator was killed in a motorbike crash so it won't be updated any more and it is difficult to find a good download. I forget which link I got it from in the end, but it took a bit of Googling and something was found that I (half) trusted!
I use "Any video Converter" to take the Registrator Viewer saved files and them save them into as different codec/format for uploading.
I'm not 100% happy with my Navman after this trip. We did a 3 days trip over to the west coast, total 860km. I formatted the 64gb memory card before setting off to make sure it was clear. I was not expecting it to be able to hold all 3 days footage but wanted as much of the 'early' footage as possible and didn't care to much about the last 100kms as we drive it often. So an hour from home I turned it off to save overwriting early footage. When I got home, I put the memory card in my PC to find it had 9gb free. I was happy with that as I assumed it had managed to record everything with space spare. Looking at the footage though, the first 2 hours was not there. I don't know why it removed it as there was free space. I was doubly unhappy cos I did an overtake of about 12 cars in 1 drag in my L Series Freelander and it was part of the footage lost! Also on the lost bit was an overtake of about 6 cars where I got up to 120kmh as I noticed a cop car I was also passing parked up on the verge. He must have been having elevensies cos he didn't come after me lights and sirens! It also lost some other small sections of footage during the trip with the .mp4 files reported as corrupt.