Catch Monitoring Sensors


All PI and PS sensors can be set up to suit your preferences. The most important parameters are the:

  • Communication channel
  • Update rate

In order to change these parameters, the Simrad PI Configurator utility is provided.

How does it work?

Once you lower a PI (or PS) sensor into the water, the water detector switch automatically turns on the sensor's electronics. The circuitry inside the sensor will then start to read the status of its own internal sensor circuitry (temperature, depth etc). Then, it will transmit the current information to the hydrophone under your vessel using an acoustic link.

The two most important factors are now:

  • how often do you wish the sensor to report back

    "How often" is commonly referred to as data update rate. This is the setting that tells the sensor how many seconds or minutes it shall wait before it reports back the next reading.

  • on which channel do you wish to receive the information

    "Which channel" is referred to as communication channel. This works is just like your car radio, where you have separate buttons to choose between radio stations transmitting on different channels.

All sensors are provided from the factory with pre-defined communication channels and update rates.

Changing a communication channel

It may be required to change one or more communication channels, and there may be many reasons for this.

  • You have more than one of each sensor. For example, if you have three temperature sensors, they MUST communicate on three different channels.
  • Other vessels near your use the same PI catch monitoring system (or a similar), and they have one or more of their sensors set up to the same communication channels as you have. This will create interference, as you will "read" each others sensors.
  • If your sensors are set up to use communication channels too close to each other (for example, you have chosen channels 4, 5 and 6), this will limit the vessel’s speed. The reason for this is the Doppler effect. If the speed is too high, the Doppler will cause the transmission frequencies to change so much that they overlap, and this will create interference. The PI catch monitoring system will provide a warning if this is about to happen! You must then either change to other communication channels further apart, or reduce the maximum shooting speed.
  • If you operate at the maximum range of the sensors, you may be able to increase this range slightly if you use lower communication channels. This is because the lower communication channels use lower transmission frequencies.

All sensors are provided with a default communication channel. In some cases you may find that the chosen channel does not suit your operational needs, for example if you have more than one sensor of any given type. This is a decision you have to make depending on how many sensors you use, and how many of these that are identical.

Changing the update rate

It may be required to change the update rate on a sensor, that is how often it sends information back to the PI catch monitoring system. A high update rate will give frequent information updates, but the sensor will use more battery power. If you need your batteries to last as long as possible, you must consider lowering the update rate.

  • A low update rate will provide you with fewer information updates, but the battery will last very long.
  • A high update rate will give you frequent information updates, but the battery will run out faster.

All sensors are provided from Simrad with a default update rate setting. In some cases you may find that this update rate does not suit your operational needs. This is a decision you have to make depending on the local fishing conditions.

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