Safety is not a waste of time, ever.
If the MP isn't setup yet, I'm sure they will be. By law, all new radios must include this feature.
So as they purchase new radios, they will have the feature.
Also, if other boats have it, it can't hurt.
It's only 10 minutes more to set this up once you have the equipment. If you have an older setup now, I wouldn't say to go running to get a new radio (same as on the ocean), but as u get new equipment, why not set it up properly?
None the less, I"m setup, if anyone ever wants to test their radio with this feature, let me know, we can coordinate it sometime.