I am familiar with signal flares myself. They would prove useful as a visual signal; they work well enough for us on expeditions.

[ He'd come up with the system himself, but that doesn't really bear mentioning. ]

If there is not already a suitable tower available, we would need volunteers for the construction of that as well.

[ In other words, this is going to require a lot of people. But then again, he supposes that is part of the reason Luceti Projects now exists. ]