A brilliant idea. Ideal for young people with special needs who find traditional compasses confusing. This only has one red needle to think about. Wearing it on the wrist means it is always available for checking direction.
The only drawback is that the strap is rather tight - designed for young children rather than teenagers.
This is one of the best bits of kit to use when on the move off the beaten track. easy to use very light and robust and can be attached to your wrist or the handlebars on my bike .