Okay, here is the top view of two different unlined, fretless basses.
The first is the Fbass AC6 I posted photos of earlier. The second is of my Barker electric upright fretless.
On the Barker, as on all fretless basses that I know of, the dots are placed where the fret would be instead of between them like on fretted basses, therefore it is an easy thing to place your finger at the midway point between two dots, and have it where the fret would have been.
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Something I hope you notice is that especially with an Fbass unlined fretless, you can
definitely see where you should be placing your fingers to play in tune. This is yet another of so many of George Furlanetto's innovations that help make him my favorite luthier.
If you are just playing a note, you can look and see where to press and do it just fine. The trick comes from playing lines and keeping it in tune with your hand changing positions... then it is another trick to do it without watching your left hand -- like when you are trying to read sheet music.
I LOVE watching and listening to Alain Caron play his AC6. Not only is he such a great player, but
he's got such great fretless tone.
For everyone's enjoyment,
here's a lineless fretless clip, courtesy of Andrea Balasso. Who wouldn't want that tone? As he solos, he is so far up the neck that you can see how the markers on the finger board under the C string can be a real help.
And
here is Mirko Testoni playing a BNF6 (lineless). Different tone, but great as well. You can really hear how that metal bridge differs from the wooden one in the last clip.
Finally,
here is Edmond Gilmore playing an AC5. Again, different tone, but so wonderful. This is an agile bass. Edmond is a monster among monsters, playing and (of course) intonation. Wow.