Same here. I even know there are 360 degrees in a circle.

Took me a while on my small phone to see there was a North, therefore the 0 was not trigonometric on the right. Then I realized that the north was not up. By the time dumb me finally understood all this, I wondered if the angle should be negative like -90 degrees when towards west, or +270??

Finally I tried to do 180+45, entered 235, was told I was again not a human, realized I was super dumb about my math, and now wondering if the 2 minutes were expired.

And just spent 5 minutes explaining all that rather than trying again. Captchas can be overkill.

Setting your heading seems to be one of the main points of the game, so it's not a bad way to make sure all players know how it works.

you just need to know that there are 360 degree in a circle. now do:

- count the segment dividers and divide 360 by that amount, let’s call this X.

- count at which divider the pointer is pointing, multiply that by X and be good.

Same here, even when using https://www.nauticed.org/images/basicsailtrim/degreesoff.jpg as a guide to pass it, I cannot get it to accept me as a human.

The captcha seems easy for a program to overcome though, so maybe it's meant to stop humans and allow robots?