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Downloads a RINEX 3.03 observation file (gzipped) for the selected station and time range. Pick the range in your local time — the UTC window actually requested is shown above, and the file is named in local time with the zone attached ({station}_{YYYYMMDD}_{HHMM}-{HHMM}{TZ}.{yy}o, the extension PPK suites like GAirHawk recognize). Ranges that cross UTC midnight are fine — they come back as one file. Times snap to whole clock hours, so 16:00–18:00 delivers 16:00:00–17:59:59. Observation epochs inside the file are always UTC, as RINEX requires and every PPK package expects. Multi-GNSS (GPS+GLO+GAL+BDS), deduplicated, antenna model HXCCGX601A NONE in the header so NRCAN CSRS-PPP applies the correct calibration. Decompress with gunzip before uploading to PPP services.