Our team is going to be taking a bike trip into the mountains, but different groups will be doing different routes and will be going at different speeds. We'd like to be able to communicate with each other and we probably will not be able to rely on cell phones. Can anyone recommend a walkie talkie set that they know has a radius of at least a few miles in the mountains? I saw a walkie talkie that claimed 50 miles ideal but reviews said 1-2 miles in the non-ideal.