I'm new to skydiving (20+ jumps) and have just received a brand new Viso from L & B in Denmark. It comes with both a wrist strap and a finger strap. Is the latter a requirement? I can imagine a traditional, analog altimeter is quite heavy and needs extra fixing around the finger, but what about this slim digital one? As you can see I tried the wrist strap, and it is rock steady. Thanks --Lars