[dzhiurgis]

IDK because European ones already work down to the centimeter...

I've just sailed into 2-3 meter wide canal after dark here in NZ. Used my previous track from earlier today. 1 meter accuracy is not precise enough to do it safely - had to look for fairly poorly lit nav marks and rocks.

[jniedrauer]

I wouldn't trust GPS down to sub-meter precision even if the spec technically supported it. I often travel a route, then turn around and retrace the exact same route, only to see the GPX data indicate fairly large variances. LEO is very large and the atmosphere is not uniform.

[craftyguy]

Or you could use lights and your eyes.. Blindly trusting anything like GPS to guide you through risky situations like that sounds like a good way to ruin your boat.

[dzhiurgis]

I would still do, but you use GPS as a confirmation rather than source of truth.

[throw0101a]

> Or you could use lights and your eyes..

Assuming there's no thick fog.

Though radar, depending on its resolution (which is determined by array/beam width), is also handy.