From SmithMountainLake.com…..
The Smith Mountain Lake Water Safety Council has provided some important tips for navigating the lake after dark.
Night vision is the most important tool for safe navigation at dark. The worst threat to night vision is white light, and the biggest culprit of that is a cell phone. Everyone has one, and just a quick shot of light from a phone screen will destroy night vision. Keep cell phones put away and tell passengers to do the same.