181
xkcd #3248: 182.8 Meters
(imgs.xkcd.com)
Title text:
They rounded down to 182.8 instead of rounding up to 182.9 because 182.9 might make the statement incorrect.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3248/
That's the whole point. 100 phatoms is really imprecise. But on translation, they didn't bother keeping the significant digit count equal, and since 182.8 m= 100 f , they just left it like that. I mean, it's the only reason he could guess there was a unit change...