1 M or m â prefix designating a number in thousands (not to be confused with SI prefix M for mega-or m for milli).
There are two types commonly referred to as: 'Shallow' and 'Deep' water. The differences are not only in the Frequency but also in the Beam Width and they are as follows: 'Shallow' water HST-WSBL 106-72 Transducer will operate on 2 frequencies on the HDS models: 200 (20Â°) & 83KHz (60Â°). 'Deep' water HST-DFSBL 106-77 Transducer will operate on 2 frequencies on the HDS models: 200KHz (12Â°) & 50KHz (35Â°).
Fishing Mode: Shallow Water. (This is the most important selection because it allows the locator to better distinguish shallow weeds and fish in the weeds. It sets the maximum water depth to 100 ft.) Noise Rejection: Low or Off Surface Clarity: Off (You may want to turn it on to Low in real shallow water or weeds. Settings of Med and above begin to remove detail) Scroll Speed: I use Normal most of the time. Ping Speed: Max most of the time. Slow it down in heavy weeds. Temp Graph, Depth Line, Amplitude Scope, Fish ID, Fish ID Beeps: All Off Frequency: 200 KHz most of the time.