guider settle time; trying to understand - by: alacant

Hi everyone
1. Using PHD2, when is the settle applied? Would it be useful to have a message to that effect e.g.
capturing dithering settling waiting... i
2. What are the units for settle (it specifies seconds but it seems much shorter)?
3.. What's the difference between this settle:

and this:

?
TIA for your patience
Clear skies,
Steve