Yep, it's a transposing instrument in terms of octave, like the upright bass (but not from another key like Bb or Eb.) So, if you play a C --- you'll hear the concert pitch C.
(as opposed to say a Bb trumpet -- where if you play a notated C, you will hear the concert pitch Bb -- so to hear a concert C, you would have to play or notate the pitch D.)
The clef to the left has an ottava bassa (the "8" below the G clef) which means...... 8vb sounding?? .... 8va notated?? huh??? (always found this so confusing as a kid, along with how the upright bass pitches are notated versus its sounding pitch.)
Anyway, most guitar music we read is written using the G clef (without the ottava bassa, since it's assumed... I think? :)
That's really great for reading guitar music --- but for composing music on the guitar for other instruments (especially when thinking about their ranges), I think it would be helpful to work with a grand staff (besides, all these Partimento bass lines are in bass clef anyway :)
FYI: I've setup a Logic Pro orchestra template with MIDI Guitar 2, a MOOV nylon guitar, and an iRig2; although, I'm thinking of moving this to a Finale/Garritan template so it's available on a laptop (to avoid the heavier sample libraries and key-switches while composing sketches.)
Full Fretboard Range Example:
Here is an example of the practical concert pitch range of the guitar fretboard (from E2 to A5 in C Major):
'C Major' scale degrees on the 6th String:
Compare the treble staff + tab to the grand staff + tab below it:
The treble staff + tab is the traditional guitar transposition, notated an octave above where it actually sounds
The grand staff + tab shows the pitches notated where they actually sound
'A Minor' scale degrees on the 6th String:
Again, compare the treble staff + tab to the grand staff + tab below it:
The treble staff + tab is the traditional guitar transposition, notated an octave above where it actually sounds
The grand staff + tab shows the pitches notated where they actually sound
'C Major' scale degrees on the 1st String:
'A Minor' scale degrees on the 1st String: