# Sound - Ergonomics - Optics

Every **detail** influences the properties of **the whole**. Each component of the guitar is made from a specific **material **and has its own special **shapes and dimensions**.

The many** interactions between these properties** offer a wide range of **combinations** that affect not only the **sound**, **beauty **and **comfort**, but also the price or** value of the instrument**.

# What is the navigator useful for?

## Body Control Points CPs

**The aim of the E-G Navigator is to find a quick and clear orientation in the shapes of different guitars.** And show how to **define the dimensions of shapes** in their actual size, using as **few boundary points with their coordinates as is at least necessary.**

For **Pickups positions**, it is sufficient to define only the **coordinate of their center on the X axis.**

The **position of the bridge** is determined by the **zero point of the body**, the **Y**-axis (**axis of the scale)** usually runs *2 millimeters before the point where the thinnest string "e" rests.*

## Headstock CPs - symmetry

Before dealing with the **contour of the headstock**, we must focus on the positions of the **shafts of the tuners** for the outer strings** E6 -e1.**

The positions of the** remaining four strings (A-D-g-b)** are **obvious** with perfect symmetry.

A **minimum of 14 checkpoints** is sufficient to enter the** head contour sufficiently**. Of course, including the **zero point on the front edge of the nut**.

## Headstock CPs - asymmetry

Before dealing with the contour of the head, we must focus on the **positions of the shafts of the tuners **for the outer strings** E6 -e1**.

The positions of the remaining four strings (A-D-g-b) are obtained by dividing the length of the line E --- e1 into 5 equal sections.

A** minimum of 13 checkpoints** is sufficient to enter the head contour sufficiently. Of course, including the** zero point on the front edge of the nut**.

## Fretboard CPs

The **outline of the fingerboard** is essentially a** trapezoid**.

*If it were a rectangle, we would have to have too narrow a string spacing on the bridge (string spacing approx. 30-40 mm).*

The **X and Y positions **of the four **corner control points** are sufficient to enter the** trapezoid.**

We need t**wo more CPs** on the edges to place the trapezoid **on the central axis**.

By entering the **position **of the** octave fret**, we define the scale length of the strings. We need a**t least 7 CPs in total**.

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