Fish finders are essential equipment on fishing boats. They range from simple models to combination units that can include mapping and navigational functions. Costs go up with features and can get into the thousands of US dollars.
In choosing a fish finder, you will need to decide on a budget. Next, consideration must be made to the different types of display formats. Black and white is the simplest with other choices being grayscale (also known as monochrome) and color. Another choice is the display type. Fish finder displays use LCD or other technologies, with choices based on price.
Several factors determine the effectiveness of the fish finder, including the following:
viewable display size
display physical type (CRT or LCD)
display format type (monochrome or color)
resolution in pixels
single or dual transducers
output power measured in RMS