TY - JOUR T1 - Navigator Notes JF - NAVIGATION: Journal of the Institute of Navigation JO - NAVIGATION SP - 669 LP - 671 DO - 10.1002/navi.456 VL - 68 IS - 4 AU - Richard B. Langley Y1 - 2021/12/21 UR - https://navi.ion.org/content/68/4/669.abstract N2 - ER -