Default pool length

The pool I usually swim at is 20m.  I believe the default pool length for the indoor swim is 25m.  So every time I go, do I have to manually change the length?

I was wondering if the watch remembers the last selected pool length, or it a programme could be set up with the pool length preset to the required length?

It's a pain to enter the length every swim, especially if I forget to do before I enter the water, as the touch screen doesn't work well with wet fingers!