Accurate bed topography is critical for predicting Antarctica's future ice discharge and sea-level contribution, yet large portions of the coastal ice sheet remain poorly mapped. We assessed radar-derived ice-thickness data coverage along the ice-sheet margin zone, focusing on dynamically sensitive sectors, using a 0.5 km grid and distance-to-data metrics. The study area encompassed a 100 km buffer from a simplified grounding line, including fast-flowing ice and regions where ISMIP6 experiments project grounding-line retreat by 2100. After filtering for GPS-quality data, over 41 million Bedmap3 measurements were analysed. Coverage varies widely across the 27 GSFC drainage basins: rapidly changing regions such as Thwaites and Pine Island glaciers are well sampled, whereas Enderby Land, Oates Land and the eastern Antarctic Peninsula exhibit gaps of 40-100 km. Ice rises and rumples are broadly undersampled despite their role in ice-shelf stability. These results provide an initial prioritization of targets for future airborne and helicopter-borne surveys. This prioritization is based primarily on existing data distribution and will be further refined through SCAR's RINGS Action Group regional efforts, ultimately supporting the development of next-generation Bedmap products. This article is part of the Theo Murphy meeting issue 'Next generation ice-sheet bed measurements'.
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