Garmin GPSMAP 168 Sounder - Manual (Page 107)

96
Appendix G
Selecting A Transducer
Transducers
The transducer acts as the eyes and ears of your new sonar. Proper transducer selection and
installation are critical to the operation of your unit. The transducer transmits sound waves toward
the bottom in a cone shape. The larger the cone angle, the larger the coverage area at a given depth.
While it is good to see as large of an area as possible, it is best to select a transducer that suits the
water that you are on.
A wide cone angle transducer works best in shallow water. The wide cone angle provides a large
coverage area, but at a decreased bottom resolution. In deeper water this can result in a large dead zone
where fi sh cannot be seen. A narrow cone angle transducer is better suited to deep-water installations.
The narrow cone angle provides a smaller viewing area (compared to a wide cone angle transducer at
the same depth) with improved bottom resolution and a smaller dead zone.
Included in the package is a 20° cone angle, temperature sensing, transom mount transducer. This
transducer provides good all-around performance. Listed below are a variety of optional transducers
and accessories which are available from your local dealer or GARMIN:
• 200 kHz, 20°, plastic, transom mount, depth only
• 200 kHz, 20°, plastic, transom mount, depth, temp
• 200 kHz, 20°, plastic, transom mount, depth, temp, speed
• 200 kHz, 20°, plastic, in-hull, depth only, 0° rise
• 200 kHz, 12°, bronze, thru-hull mount, depth only
• 200 kHz, 12°, bronze, thru-hull mount, depth, temp
• 200 kHz, 12°, plastic, thru-hull mount, depth only
• 200 kHz, 12°, plastic, thru-hull mount, depth, temp
• 200 kHz, 14°, plastic, trolling motor, depth, temp
• 200 kHz, 9°, bronze, thru-hull, depth, temp, speed
• 200 kHz, 8°, plastic, transom mount, depth, temp
• 200 kHz, 8°, plastic, transom mount, depth, temp, speed
• Speed Sensor
• Temperature Probe
• 10 ft. Extension cable for transducers
• 20 ft. Extension cable for transducers
X
X
dead zone
fish not seen
Wide cone angle
Narrow cone angle
168 Manual Part 2.indd 96 11/18/2002, 3:38:14 PM