Cycling GPS units are becoming cheaper and more sophisticated. The new Rider 20 from Bryton is a powerful unit that has a heart rate and calorie function based on GPS measurements. It is also ANT+ compatible so you can use it as a powerful training tool. The large font is easy to read even in bright sunshine and it is also waterproof, so no need to put it into your jersey pocket when the rain comes down. As with all Bryton products, you can share your training using the Brytonsport Community software. Available mid December.