I use a very popular casio digital watch for outdoor activities. It is reasonably cheap, soldiers around the world love them, light weight, a back light to see the time at night, 100m WR. However, I have found an even cheaper very popular version. If you use the code PICKLE, it is only $35.00. It is rated 4.5 out of 5 from nearly 4,000 reviews! Battery lasts up to 10 years - I think my one is past that. The watch I have is a 5600 - one advantage of this one is it has a recessed glass, it has never been scratched, but over $100.