1. Copyright 2008 Coast Guard Auxiliary Association, Inc.
The Weekend Navigator
Part II
Copyright 2008 Coast Guard Auxiliary Association, Inc.

2. Chapter 16: Using Depth in Navigation

3. Depth Sounders versus Sonars and Fishfinders
Depth sounder consists of a processing and display unit and transducer
Depth of water is measured by the round-trip time of the echoes and displayed in feet

4. Depth Sounders versus Sonars and Fishfinders
Fishfinders are a variation of the depth sounder
Return all echoes on screen in graphic form
Sonar is capable of steering the beam like radar
Sonar range is usually limited to hundreds of feet

5. Navigating with a Depth Sounder
Using depth with a GPS and charts
Quick way to cross check your electronics
Helps with changing depths in shoal areas
Using depth without GPS
Using depth with radar

6. Navigating with a Depth Sounder
Using depth with a GPS and charts
Quick way to cross check your electronics
Helps with changing depths in shoal areas
Using depth without GPS
Good backup for navigating
Use dead reckoning and plot your course

7. Navigating with a Depth Sounder
Using depth with radar
Can be combined with radar to determine to give a relative location
More effective as you get closer to shore