Aotus
Contributor
The large screen on the petrel (compared to watch-style computers) makes a huge difference, especially in low light and low vis, and this is coming from someone with better than 20/20 vision. It's not just about liking bigger text, the glowing readings and large text together sort of trains you to keep an eye on your depth and NDL, but without and hassle or distraction. I really think it made me a better diver by keeping me aware.