Aquapac Waterproof Armband Case – Small (216) Price: £19.49 (as of 28/03/2023 18:57 PST- Details) & FREE Shipping.

100% waterproof to IPX8 (guaranteed submersible to 5m for 30 mins).
Everything works normally through the case including the capacitive touchscreen (Note: touchscreens do NOT work underwater).
Many phones/GPS units will float in this case but test yours in a basin first before you throw it in the sea!

Usually dispatched within 24 hours