Don’t use a pencil! Go to Walmart or somewhere and you can find adhesive dots in the school supplies section. They come in nice colors like bright pink. Put them dead in the middle of the board so they don’t interfere with the strings (I hate to see school bass fingerboards with strips of masking tape across the entire width, or around bows, that’s just horrible!). I stick them on my students’ basses at the natural harmonic positions. This is helpful since they don’t always play on the same bass, and I teach scales well into thumb position pretty much from the beginning. I stick dots on my own basses when I have adult students coming over for lessons. This creates a little comedy when I then take the bass out for a gig. I find myself looking for the dot sometimes when I wouldn’t be thinking about finding the note at all if the dots weren’t there. And, well, I am generally pretty well paid for freelance jobs, so I know some people must be scratching their heads when they notice pink dots on my board.
As far as Edgar goes, I don’t quite understand. I play mainly orchestra stuff, so I don’t have to make leaps into the stratosphere the way he does, but when I do have a big forward shift to make, I just practice the move on the bass I will be performing on until I get it consistent. I don’t see how markers would help me. When I play solos, I generally have my eyes closed. When I play orchestra, I am watching the conductor and the other basses. When I play jazz, I am split between the faces of the other musicians and the babes in the audience (scratch that!). The point is, I don’t even like looking at my music, let alone my instrument.
Robobass
Also, the recurring theme about hitting the note slightly off and quickly adjusting is just false. If you play that way you sound that way. The only way to sound in tune is to be in tune. Develop your left hand technique and aural acuity to a point where you hit every note (or at least almost every note) dead on. Until you can do that, you are just another wannabe.