Free hand acoustic probe tracking

An apparatus for acoustic inspection, comprising:

• an acoustic probe assembly comprising:
• an electroacoustic inspection transducer configured to transmit acoustic pulses for the acoustic inspection and to receive echoes elicited by the acoustic pulses for the acoustic inspection;
• and
• an electroacoustic telemetry transducer configured for transmission of an acoustic telemetry signal separate from acoustic pulses or echoes for the acoustic inspection, the electroacoustic telemetry transducer separate from the electroacoustic inspection transducer;
• and
• at least one electroacoustic receiver configured to receive the acoustic telemetry signal;
• a visual indicator;
• a processor circuit communicatively coupled with the electroacoustic telemetry transducer and the at least one electroacoustic receiver;
• and
• a memory circuit comprising instructions that when executed by the processor circuit, cause the processor circuit to:
• using a received representation of the acoustic telemetry signal, determine at least one of (1) a position of the acoustic probe assembly relative to a reference position or (2) an orientation of the acoustic probe assembly in relation to a reference orientation;
• and
• using the visual indicator, present an indicium to a user of at least one of (1) the determined position or (2) the determined orientation.