A navigation system for tracking an object, said navigation system comprising: a tracking device (44, 46, 48) including a tracking head (212, 312, 412) having a tracking element (50, 60, 70) configured to transmit a tracking signal, said tracking device (44, 46, 48) being attachable to the object; a sensor configured to receive the tracking signal from said tracking element (50, 60, 70) to determine a position of the object; an error indicator configured to indicate an error in said sensor receiving the tracking signal from said tracking element (50, 60, 70), and said error indicator including a first light emitter (302, 402) and a second light emitter (302, 404); and a computing system configured to: determine if said sensor received the tracking signal from said tracking element (50, 60, 70), generate an error signal if said sensor did not receive the tracking signal, and wherein the computing system is further configured to: - activate said first light emitter (302, 402) in response to generating the error signal, and deactivate said second light emitter (302, 404) in response to generating the error signal; or - activate said first and second light emitters to emit a first colored light in response to generating the error signal and to emit a second colored light in the absence of the error signal, said navigation system being characterized in that said error indicator is supported by said tracking head (212, 312, 412). a tracking device (44, 46, 48) including a tracking head (212, 312, 412) having a tracking element (50, 60, 70) configured to transmit a tracking signal, said tracking device (44, 46, 48) being attachable to the object; a sensor configured to receive the tracking signal from said tracking element (50, 60, 70) to determine a position of the object; an error indicator configured to indicate an error in said sensor receiving the tracking signal from said tracking element (50, 60, 70), and said error indicator including a first light emitter (302, 402) and a second light emitter (302, 404); and a computing system configured to: determine if said sensor received the tracking signal from said tracking element (50, 60, 70), generate an error signal if said sensor did not receive the tracking signal, and wherein the computing system is further configured to: - activate said first light emitter (302, 402) in response to generating the error signal, and deactivate said second light emitter (302, 404) in response to generating the error signal; or - activate said first and second light emitters to emit a first colored light in response to generating the error signal and to emit a second colored light in the absence of the error signal, said navigation system being characterized in that said error indicator is supported by said tracking head (212, 312, 412). - activate said first light emitter (302, 402) in response to generating the error signal, and deactivate said second light emitter (302, 404) in response to generating the error signal; or - activate said first and second light emitters to emit a first colored light in response to generating the error signal and to emit a second colored light in the absence of the error signal, said navigation system being characterized in that said error indicator is supported by said tracking head (212, 312, 412).