Got light?

You do have a flashlight aboard, don't you?  You should.

Aside from all the "regular" things you'd use a flashlight for when ashore, on a boat you'll also want to have one handy so that:

1. You can inspect the bilge
2. You can inspect your shaft log packing
3. You can inspect your thruhulls... all your thruhulls, especially if item #1 has suddenly become important...
4. You can signal other boats
5. You can bungee it to something astern to serve as an emergency stern lite (don't ask)

Now, how about a red flashlight, for all of those things above, when you don't want to ruin your nite vision?