Finally got serious about synchronizing the RTCs for multi-unit deployments to improve data quality for things like tide signal analysis. Clocks are sync’d the leading edge of a GPS time-pulse and the Aging register is tuned to reduce drift. The quid pro quo is that the reduced drift within the tuning temperature range increases non-linearity at more extreme temperatures. But our underwater/cave research sites are quite thermally stable compared to outdoor climate stations, so it’s worth that tradeoff. Setting Accurate RTC time with a GPS & the DS3231 Aging Offset to Reduce Drift | Underwater Arduino Data Loggers
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