Custom reference lines are here: drag a line onto any favorite station's chart — tide or current — and see a table of exactly when you're above or below it. On a current station, mark a safe velocity to catch slack water before transiting a pass (Pro). Set alerts for high and low tides, current extremes, your reference line, or slack water itself — plus new Moon Over Water alerts for when moonrise or moonset lines up with sunset or sunrise (Pro). Choose how many months of tide data stay cached on your favorite stations, so you're covered even without a signal. Fixed watch offline caching and widget localization issues.