It is alaso dependent on agency as to what is required in the OW course. Since I do not do checkout dives with students stationary to evaluate skills as we do them while swimming I spend more time on compass use in the classroom and the pool than was done in my OW class. Even though the pool is small it can still be used to teach how to hold the compass properly, changing headings while hovering, and swimming a heading. And since the checkout dives are an evaluation to insure the students can dive without an instructor dive four or five is done entirely by the student with me observing and making sure nothing happens. So they plan the dive, plan the course, and then they lead the dive so they are responsible for navigating.
I have always considered the ability to navigate under water a core skill and mark of a competent diver. It's why I wrote a course to teach it in a way that fosters success and a desire to actually work at it. Some UW Nav courses and intros to it like are in the AOW courses of some agencies are fine if you have 30 feet of vis or more. But around here we do not so going by the book does more to create frustration and unrealistic expectations.
UW Nav takes practice, patience, and small steps as well as teamwork to really learn effectively. I have had several private students for it one on one and I make it clear to them that because they are not part of a regular buddy team they are going to have spend more time and move slower to get good at it.
It is the class I most recommend divers take after Open Water along with Rescue. If divers have not had rescue skills in their OW class they should do that and then UW Nav. If they have had those skills such as are taught by SEI or NAUI in their OW classes, then UW Nav is what I want to see them do before any other advanced classes. Including AOW.