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 . <EOS>