# NanoVNA: Smith chart units

I am trying to understand the units NanoVNA uses for its smith chart.

After calibration, for an "open", I see this:

The units are: $$\ 1000m-j71.4m \$$ , where I suppose 'm' stands for mili, which does not make sense for the resistance, $$\1000mΩ\$$ aka $$\1Ω -j0.0714\$$ would look like that on a smith chart:

My guess is that, it means 1000Ω instead of 1000mΩ...

A second screenshot, for the 50 Ohms:

$$\ 36.8m - j70.5m \$$ is that $$\ 36.8 mili-Ω\$$? it is not even close to be in the center of the smith chart.

Units are $$\ -1.013 -j31.6m \$$ , resistance can't be <0.. but assuming resistance is 0 here, its pretty close to reality..

A random point with a new calibration shows a negative resistance, and I cant figure out what "$$\-j688m\$$ " is supposed to be, I can not math these values to a smith chart calculator to come close to that point.

So I did not use the proper units, there is an option to change the units to $$\ R + jX \$$ instead of the default $$\ Re + Im \$$.