Wow, that is kind of tough....

We, here, all know that a topo map is no good at all unless you know how to read it. But let's assume you do know how to read one. Here's 48 words describing why it is important to carry one:

"If you know where you are, you are not lost.

A topo map provides the means to quickly locate your position on the map by orienting the map and locating two or more topographic features displayed on the map and referencing those features with line of sight."

You might add these 20 words:

"A GPS will fail for many reasons, so it's not a replacement, it's an enhancement that cannot be relied upon."

That's certainly not perfect, but it's a something to start working with.