References
- Ayres , J. E. 1976 . ARGO Revisited. Lighthouse . Journal of the Canadian Hydrographers’ Association , Edition No. 14 (draft).
- Heldwein , C and Jekel , R. . Description of a Single Frequency Multiple User Active Ranging Positioning System . Paper presented at the PLANS 1976 Position Location and Navigation Symposium . November 1–3 , San Diego. (draft).
- Lowndes , R. J. April 4 1976 . Report on the Automatic Ranging Grid Overlay (ARGO) System , Report to the Hydrographer of the Navy April 4 , Taunton, Somerset, , England