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FM-CW radars have revealed many unique marine boundary layer echoes in great detail and permit new interpretations when they are operated simultaneously with other remote sensors. Three different subject areas and associated observations are presented. First, an FM-CW radar can provide information on tropospheric radio propagation conditions through a refractive index profile updating procedure. Mesoscale variations in radio propagation conditions can be obtained when separated FM-CW radars are operated simultaneously. Second, highly distinct radar echoes, created by wing tip vortices, have been observed at a commercial jet airport. Third, simultaneous observations with two FM-CW radars can reveal important submesoscale features.