Navigation unit having time shared operation

Navigation warning system and method

Navigation-monitoring apparatus

Navigational aid

Navigational aid device

Navigational aids

Navigational and collision avoidance apparatus

Navigational guidance method for a plurality of vessels

Navigational systems using phase encoded angular coordinates

Navigational systems using phase encoded angular coordinates

Near carrier AM-FM calibration technique

Near field antenna boresight alignment apparatus

Near field antenna measurement systems and methods

Near field location system and method

Near field nulling antenna systems

Near isotropic circularly polarized antenna

Near-field focused antenna

Near-field plasma reader

Near-isotropic low-profile microstrip radiator especially suited

Near-range personnel beacon locator apparatus