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Typically, the higher frequency (200 kHz) provides the best resolution and definition of structure and targets. 50 and 83 kHz frequencies have much greater depth penetration capability, but show less definition. Suitable transducers will support 200kHz, and will also support one of either 50 or 83kHz.
There are a number of things you should check before going out to buy a new unit. These steps will get your sounder set up correctly, and you may wish to tweak settings slightly after.
1) The “Fishing Mode”. This is found by pressing menu twice, the selecting sonar, then fishing mode. Please ensure you have the correct setting for your use. In depths less than 40 metres, you should use “shallow water”.
2) Check the primary frequency you are using. For your shallow water, you should be using 200kHz. This can be found in the sonar menu.
3) Check the sensitivity and range settings, and select as suitable (auto is fine). These are also found in the sonar menu.
4) Ping Speed controls the rate the transducer uses to send sonar waves into the water. A higher ping speed will yield the best results when you are moving across the water at a high rate of speed or fishing from a dock. If the ping speed is too fast, it can cause interference on the screen. Try experimenting with this (also found in the sonar menu).
Click the link below for the HDS sonar user guide, with config, setup and full information.
http://invisiblecommunications.com.au/images/lowrance%20hds%20sounder%20guide.pdf
Please feel free to call on my mobile any time or email info@invisiblecommunications.com.au
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