Lowrance electronic LMS-480M, LMS-480DF manual How LMS-480 Sonar Works

Custom mapping:	MapCreate 6 software optional; optional
	LEI FreedomMaps offer the same high-
	detail without the work of MapCreate; Navi-
	onics charts on MMC cards optional.
Mapping memory:	More than 256 MB on one MMC (or SD) card.
Position updates:	Every second.
Position points:	1,000 waypoints; 1,000 event marker icons.
Audible alarms:	Arrival/off-course/anchor.
Graphic symbols for
waypoints or event
marker icons:	42.
Routes:	100; up to 100 waypoints per route.
Plot Trails:	10 savable; up to 9,999 points per trail.
Zoom range:	39 ranges; 0.02 to 4,000 miles.

NOTE:

The above memory capacities refer only to LMS-480's on-board memory. The amount of GPS or sonar data you can record and save for recall later is only limited by the number of MMC cards you have.

NOTICE!

The storage temperature range for your unit is from -4 degrees to +167 degrees Fahrenheit (-20 degrees to +75 degrees Celsius). Extended stor- age in temperatures higher or lower than specified will damage the liq- uid crystal display in your unit. This type of damage is not covered by the warranty. For more information, contact the factory's Customer Service Department; phone numbers are listed on the last page.

How LMS-480 Sonar Works

Sonar has been around since the 1940s, so if you already know how it works, skip down to read about the relatively new technology of GPS. But, if you've never owned a sonar fish finder, this segment will tell you the under water basics.

Sonar is an abbreviation for SOund NAvigation and Ranging, a technol- ogy developed during World War II for tracking enemy submarines. (Lowrance developed the world's first transistorized sportfishing sonar in 1957.) A sonar consists of a transmitter, transducer, receiver and dis- play. In simple terms, here's how it finds the bottom, or the fish:

5