In reply to Graham Callander:
I always used a basic Casio.
Stopwatch,alarm, light, time, all you need really.
I also liked to use the hour beep on alpine routes, a reminder to get on it.
I suppose bigger buttons are available on some models but I liked the simplicity of the basic one.
Another Casio for you?
I usually pace count or estimate distance rather than time navigation.
Post edited at 21:37