I have just purchased an
observer and used it with great success whilst skiing. The only disappointment is the alarm - which frankly is a joke.
The alarm is so quiet it would not wake a mouse. I went back to the shop to hear another one just in case there was a fault with mine.
The tone is a bad one for me (male in 40's) being exactly where I have hearing loss which I am told in my pilots medicals is absolutely normal for a male of my age.
I take it there is no fix for this, but suggest you change the tone and increase the volume. Or cut the alarm out altogether and you will not dissappoint future customers.
The mind boggles as to how you can make use of the altitude alarm. You need totally silent conditions and the watch strapped to your ear!