The motion-picture presentation mentioned above is a nicely produced presentation, and much better instructional quality than the initial video that begins this thread, which shows some guy fooling around at an inlet, and trying to surf down the front of big waves.
However, you need to skip the first 7-minutes and 45-seconds of blah-blah-blah, to get to the actual information in the New Zealand presentation. And at that point, the video describes how to LEAVE an inlet and go out to sea.
Later in the film, returning to the inlet is demonstrated. This begins at about 10-minutes-20-seconds into the film.
This link will take you to the information about returning to the inlet, skipping about ten minutes of preliminaries:
https://youtu.be/uNTk2IejfFE?t=628In this film they talk about "crossing the bar", which refers to the typical shallowing of water depth due to sand deposits or sand bars that are common at many inlets. Wave height builds up as the bottom shoals approaching land, and this is a situation found in many harbor entrances. The film does not talk about waves stacking up due to the influence of an outgoing current from the river or from a tide. Tide effects or other outgoing current effects are very briefly mentioned, but never explained. Also, at the inlet shown, there is not a narrow channel with boulder rip-rap defining the channel. The channel is a broad and open entrance.
The important points mentioned in the narration are:
--pick a wave to cross the bar
--stick with one wave and stay with it; no fooling around with any other waves
Although not explicitly mentioned in the narration, the boat is to be maintained behind the crest of the wave you are following into the bar. This is shown in an animation illustration, but the narrator does not reinforce the importance of this location.
--stay focused on what is ahead; another crew watches behind for any waves catching up with you
--if you don't stay with the wave you have chosen, you will fall behind, risking the next wave catching up to you and capsizing your boat
--proceed straight-on and at adequate speed
--you will know when you are across the bar when the water becomes calmer