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The marine radars are available in X-band and S-band frequencies. X-band operates at a
frequency of approximately 9.4 GHz, while S-band operates at approximately 3 GHz. X-band
offers greater resolution and detection of smaller targets, but is subject to interference from rain
and seas. S-band radar has a longer range and less interference from rain and sea clutter, but has
less sensitivity for small targets
A ship will typically use her X-band unit near shore, due to its higher resolution and ability to
detect smaller targets, but depend on S-band while at the “open seas”. It is recommended for
large oceangoing vessels to install both X-band and S-band radars
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