During a recent cruise i created a timelapse that started before we left the dock and ran continuously until we returned a week later. Here is how I did this without any interruptions in the video.
Equipment
For this project I purchased a GoPro Hero 9 Black. I chose this camera for the quality of the images and the durability. I went with a 256GB memory card.
In order to keep the GoPro running for multiple days, you will need to replace the door that seals off the battery with one that will let a power cord through.
You will need a USB-C Cable and a battery that you can plug into for a few days. The battery that I linked to is amazing, it has an LED display that shows the percentage remaining so you can tell when you need to recharge it.
The last piece to the puzzle is how to mount it to the railing. I purchased this GoPro wrist mount and it fit nicely on the railing. I was concerned with it being secure, so I bought additional velcro wraps.
I was in room 8600, here are photos of the setup from the outside.
I set it up to take 1 picture every 10 seconds. I ran the USB cable from the GoPro to the battery, which I put in a plastic bag on a chair to protect it from the elements in Alaska. The key to this is never touching the GoPro after it starts. I created a few timelapses of my backyard before my cruise to ensure that I had the settings right and the battery working properly, I would highly recommend that you do the same.