Specifications

IS15 General Manual
74 20220760L
Figure 6-17 Depth Transducer connections
When installing Airmar depth transducers with a 200KHz-G
designator, a 2 Kohm resistor should be connected across the
terminals as shown. The resistor provides a better impedance match to
the particular element used in these transducers, hence erratic readings
are avoided in very shallow waters.
The P52 and the SS505 listed by Simrad have a 200KHz-G designator
and will need the 2 Kohm resistor. Other Airmar depth transducers
listed by Simrad have a 200KHz-U or 200KHz-B designator.
Figure 6-18 Speed/Temp Transducer connections