To determine the area covered by the sonar system, we need more details about how the sonar system operates, specifically the range or radius of the area it can cover.

However, in typical scenarios involving sonar and coordinate grids, the sonar system might be represented as covering a circular area on the grid. In that case:

1. Identify the radius: The sonar's range or the distance from the sonar device to the edge of its coverage area is the radius of the circle.
2. Calculate the area of the circle: The area $A$ of a circle is given by the formula: $A = \pi r^2$ where $r$ is the radius of the circle.

If we assume the sonar's coverage area is circular and you're given the radius in miles, you can substitute that value into the formula.

Without specific information on the radius, let’s assume a hypothetical radius for calculation. If the radius of the sonar system's coverage area is $r = 3$ miles, for example, then:

$A = \pi \times (3)^2 = \pi \times 9 \approx 28.3 \text{ square miles}$

This is just an example. If you provide the actual radius, I can calculate the precise area for you.

Would you like to proceed with this example, or do you have the actual radius?

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Relative Questions:

1. What is the exact radius of the sonar system's coverage area?
2. How does the accuracy of sonar detection change with different radii?
3. What factors can affect the area covered by sonar in an actual ocean environment?
4. How does the shape of the ocean floor influence sonar readings?
5. Can sonar detect the depth of underwater objects, and if so, how is this calculated?

Tip: When working with sonar, always account for the medium through which the sound travels, as it can affect the speed and accuracy of detection.