Or just have it explained clearly in the race regs under the route description section where it should be? Races are often in places with less than ideal signal so digital is not always the solution.100%
The issue was... specifically with the routes. I heard one thing, my friend heard another and the night before the race heard another thing from the organizers themselves (which ended up being different to what was said the following morning). So there was a lot of confusion. It was eventually cleared up in the mornings riders briefing, however we all know that not every single rider pitches to riders briefing.
We live in the 21st century. Record riders briefing and post the video on all social media's (can honestly take 10 minutes). Then host the riders briefing in the morning as per norm.