If you are trail driving on a terrain that has limited road access, you will want to be sure to pack a set of binoculars and flag-pack your athletes. That means putting a square that is at least 12″ x 12″ on them to use in an emergency situation.
It has to be large enough to see it through binoculars with them waving it. I try to make them a color that is so unique that I will see it against the terrain. If you’re in a desert bloom, yellow is a terrible idea. If you’re in a red rock canyon the color red is also a terrible idea. So my advice to trail drivers is to know your terrain color, and then look for a completely different color for the flags.
No matter what the athletes are doing in that terrain – mountain biking, hiking, climbing and/or running – you will need to put on the athlete a single flag that will allow you to see them through a set of binoculars to send them help. Sometimes I will tie this on a bike, put it in their rucksack, or let them use it as a headband.
If the trail driver will not have access to them with a vehicle, or have very limited access, you will want to have a secondary trail driver there with some sort of bike or small motorized vehicle to be able to get to them on the trail. Always pack the main vehicle with everything that you need. That gives any additional trail support a central location that they can gravitate towards to get any additional supplies that they need .
On particularly rough terrains we will often send a trail runner on the trail with all of the medical needs and sometimes tools, and have a roadside team awaiting at specific areas. This is where walkie-talkies can be a magical addition to binoculars.
Be sure to send a set of binoculars with anyone who is going to have to search for an athlete on a trail that is more than a mile away. In a pinch I have watched people use an iPhone camera to take a picture of an area, then zoom in with their fingers so they can visually search the area that way.
Trail drivers should be scanning the terrain every few minutes depending on how difficult the terrain itself is.