He recently released a full video tutorial for the GPR-B1000, which covers how to use all the functions of the watch. It is the only complete video guide for the GPR-B1000 on YouTube. The video is useful for new owners who want to learn everything about the watch, as well as interested shoppers who want to see all the features up close and in action. The video is is quite long at about an hour and a half, but there are time stamp links in the description, so you can easily skip sections or come back to the video later.
WatchUP69 Mr Rangeman also has videos about other G-Shock models and other watch brands that are worth a look.