This frequency is useful for getting a deep, wide overview of the area so that any areas of interest can be identified and then examined in detail with the 200 kHz frequency.
When to use Mixed
The Mixed frequency combines the 200 kHz and the 50 kHz echoes on one sonar display, filling
in detailed echoes in the center of the sonar cone.
When to use 50/200 kHz
Operating the 657 at both 50 kHz and 200 kHz simultaneously on a split display can be very useful when operating in shallow to medium water, typically less than 500 ft (150 m), because the 50 kHz section of the display shows the general area, while the 200 kHz section can be viewed simultaneously for a more detailed look at any interesting feature.
To use 50/200 kHz, select the Split 50/200 display (see section
A
BB
ANarrow angle, more detailed 200 kHz cone B Wide angle, less detailed 50 kHz cone
Northstar Explorer 657 Installation and Operation Manual | 35 |
