Does this mean what I take it to mean?

You see the Mode S trace of an aircraft on your computer, dash into the garden, see a tiny point of light at the end of a contrail and then tick it off in a book as ‘seen’?

Not quite that simple, personally i have to be able to positively indentify the particular airline/aircraft represented on the screen with my binoculars, for me a tiny unrecognisable dot at the end of a contrail does not represent a positive i.d.
If the aircraft is easily indentified then i mark it in my log book as an overflight. In my fleet listing book regs/serials gained using sbs1 are marked in green until i see the reg myself where upon it then gets marked in black like all the regs i’ve read off in the more usual manner.

-Dazza