CSV: Format your csv file into five columns, include the header row exactly in following order: ID,latitude,longitude,N_S_Y_km,E_W_X_km. (sample csv)

geoJSON: Supports point (sample.json) geometry type. Most desktop GIS software (e.g. ArcGIS, QGIS) or online tools (e.g. OGRE, mapshaper) can convert your geographic data into geoJSON fromat. GeoJSON uses a geographic coordinate reference system, WGS84, and units of decimal degrees.