In reply to pasbury:
Having used radios on long routes for about two years now, I couldn’t disagree more. It saves your voice and can save the day when things go wrong at the end of a 60m pitch, with complicated terrain and rope drag, where it becomes impossible to give either rope or voice signals.
Yeah, not really needed on a two pitch limestone route but it sure is helpful on longer routes and I’m not entirely sure why you think the signal cannot be trusted. The radios I and two more parties I climb with use are Binatone Action 1100, with a maximum range of 10km. Never even considered the possibility of no signal, because it’s not something that happens at pitch length distances.
You can always fall back to regular signals where possible but having radios is a definite QoL improvement.