Garmin looks set to take the fight to GoPro with the arrival of the VIRB Ultra 30 action camera.Shooting 4K movies at 30fps, footage can also be captured at 2.7K (60fps), 1080p (120fps) and 720p (240fps), so there's plenty of scope for capturing breath-taking slow-mo videos. Meanwhile, still images can be captured at 12MP and 8MP, with burst shooting...