Worksheet: Identifying Lines, Segments, and Rays in Navigation Tools

Instructions: Look at the navigation tools below and identify the lines, segments, and rays present in each tool. Write your answers in the space provided.

1. Compass:

Lines: - Magnetic North Line - Cardinal Directions (North, South, East, West) - Intermediate Directions (Northeast, Northwest, Southeast, Southwest)

Segments: - Directional Arrow (Rotating Needle)

Rays: - None

1. Map:

Lines: - Latitude Lines (Equator, Tropic of Cancer, Tropic of Capricorn) - Longitude Lines (Prime Meridian, International Date Line) - Contour Lines (Elevation)

Segments: - Scale Bar - Legend

Rays: - None

1. Sextant:

Lines: - Horizon Line - Index Mirror Line - Arc Graduations

Segments: - Telescope - Index Arm

Rays: - Sun’s Ray (Used for celestial navigation)

1. GPS (Global Positioning System):

Lines: - None

Segments: - Satellite Signals (Received by GPS device)

Rays: - None

1. Nautical Chart:

Lines: - Latitude Lines - Longitude Lines - Depth Contour Lines

Segments: - Compass Rose - Scale Bar

Rays: - None

1. Telescope:

Lines: - Crosshairs (Reticle)

Segments: - Telescope Tube - Focusing Knob

Rays: - None

1. Altimeter:

Lines: - Altitude Scale

Segments: - Barometric Pressure Scale - Needle or Digital Display

Rays: - None

1. Radar:

Lines: - None

Segments: - Radar Screen - Radar Sweep

Rays: - Radar Waves (Used for detecting objects)

1. Marine Sextant:

Lines: - Horizon Line - Index Mirror Line - Arc Graduations

Segments: - Telescope - Index Arm

Rays: - Celestial Bodies’ Rays (Used for celestial navigation)

1. Gyrocompass:

Lines: - None

Segments: - Gyroscopic Mechanism - Compass Card

Rays: - None

Note: Some tools may not have all three elements (lines, segments, and rays).