3
We've made it easy for you to keep up with our latest updates — just
subscribe to our free e-mail software release notices. Look for the link
at the bottom of our Product Software Upgrades web page.
What is radar?
The word "radar" is an acronym for "RAdio Detecting And Ranging." In
simple terms, this is how it works:
A radio transmitter sends out a quick microwave pulse. A receiver listens
for that signal's echo when it bounces back from something in its path.
When the echo returns, it is processed by a computer to determine rela-
tive distance, position and bearing of the object that reflected the sig-
nal. This information is displayed on the display unit's screen. Other
boats or ships, navigational markers, landmasses and the like are re-
ferred to as targets.
By knowing how long it takes for a signal to return, the distance to a tar-
get can be determined. As the radar antenna scans through a 360 degree
rotation, it can show where the target is relative to your position. By re-
peated scans, you can see which direction another vessel is moving.
The following two pages show the basic components of your radar dis-
play screen, which is commonly referred to as the PPI, an old term from
the early days of radar.
How to use this manual: typographical conventions
Many instructions are listed as numbered steps. The keypad and arrow
"keystrokes" appear as boldface type, so you can easily skim the in-
structions and pick out what menu command to use.
Arrow Keys
The arrow keys control the movement of dotted cross-hair lines on your
mapping screen called the cursor. The arrow keys also control a hori-
zontal line depth cursor on the sonar screen. The arrow keys also help
you move around the menus so you can execute different commands.
They are represented by symbols like these, which denote the down ar-
row, up arrow, left arrow and right arrow:
↓
↑
←
→
.
Keyboard
The other keys perform a variety of functions. When the text refers to a
key to press, the key is shown in bold. For example, the "Enter/Icons"
key is shown as
ENT
and the "Menu" key is shown as
MENU
.
Menu Commands
A menu command or a menu option will appear in small capital letters, in
a bold sans serif type like this:
R
OUTE
P
LANNING
. These indicate that you are
