The spectral scanner only detects one water source at a time, and there are places on Mars where there is more than one water source within the sensor's range.
This could be adjusted by implementing a technology that unlocks multi-detection for the scanner, making it possible to simultaneously locate multiple water sources and multiple underground mining veins if they all exist within the same range.
This technology might require the spectral scanner to be upgraded to its maximum level to be unlocked.
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