A system comprising: a) a tag, said tag comprising an antenna; b) an attachment component comprising at least one location emitter, wherein said attachment component is configured to be attached to a hand-held medical device with a device tip; c) a plurality of witness stations; d) a display component integral with said attachment component, wherein said display component comprises a display screen, and e) a computer system that receives information from said plurality of witness stations and generates data about the position of said tag and said medical device, and provides said data to said display component; wherein said display screen displays: - a tag indicator which corresponds to the physical location of said tag, and - at least one of the following additional indicators: A) a total distance indicator which indicates the distance of said device tip to said tag, B) a medical device indicator which corresponds to the location of said medical device with respect to said tag, C) a tag-tip vector indicator which provides a representation of the two-dimensional distance, and two-dimensional location, of said device tip to said tag; and D) a depth indicator which provides an indication of how high above, or below, the device tip is with respect to said tag. a) a tag, said tag comprising an antenna; b) an attachment component comprising at least one location emitter, wherein said attachment component is configured to be attached to a hand-held medical device with a device tip; c) a plurality of witness stations; d) a display component integral with said attachment component, wherein said display component comprises a display screen, and e) a computer system that receives information from said plurality of witness stations and generates data about the position of said tag and said medical device, and provides said data to said display component; wherein said display screen displays: - a tag indicator which corresponds to the physical location of said tag, and - at least one of the following additional indicators: A) a total distance indicator which indicates the distance of said device tip to said tag, B) a medical device indicator which corresponds to the location of said medical device with respect to said tag, C) a tag-tip vector indicator which provides a representation of the two-dimensional distance, and two-dimensional location, of said device tip to said tag; and D) a depth indicator which provides an indication of how high above, or below, the device tip is with respect to said tag. - a tag indicator which corresponds to the physical location of said tag, and - at least one of the following additional indicators: A) a total distance indicator which indicates the distance of said device tip to said tag, B) a medical device indicator which corresponds to the location of said medical device with respect to said tag, C) a tag-tip vector indicator which provides a representation of the two-dimensional distance, and two-dimensional location, of said device tip to said tag; and D) a depth indicator which provides an indication of how high above, or below, the device tip is with respect to said tag. A) a total distance indicator which indicates the distance of said device tip to said tag, B) a medical device indicator which corresponds to the location of said medical device with respect to said tag, C) a tag-tip vector indicator which provides a representation of the two-dimensional distance, and two-dimensional location, of said device tip to said tag; and D) a depth indicator which provides an indication of how high above, or below, the device tip is with respect to said tag.