Azimuth Elevation Calculator
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C-Band requires larger VSAT antennas ranging from 2.4m - 3.8m.

C-Band is used by vessels that move frequently from region to region making lower priced, regional Ku-Band coverage impractical due to having to switch beams more often, and traverse ocean areas where Ku-band coverage is unavailable.

A global C-Band beam covers about 1/3rd of the globe, which is all the area visible from the satellite. The whole world can be covered with 3  global beam satellites.

Intelsat’s Network Broadband Maritime Service

C-Band satellites often also have hemi  beams (half the visible globe) and zone beams which provide higher signal strengths in certain areas.