Here is a Bluetooth speaker made with golfers in mind. The Precision Pro Ace Speaker has a LCD display and convenient remote. It connects to your golf cart magnetically and has a rechargeable battery that lasts up to 24 hours on a single charge. You can use this speaker to easily get GPS distances to the front/center/back of the green.
This speaker works with all your favorite streaming surfaces, including Spotify, Pandora, and Amazon Music. The companion app comes with information for over 37000 courses.