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Two marine & boating tools, side-by-side. See which fits your task.
Marine & Boating
Reference for international code of signals: alphabet flags and numeral pennants.
Open Nautical FlagsMarine & Boating
Calculate speed in knots from distance and time, or time from speed.
Open Knots CalcYour specific task is reference for international code of signals: alphabet flags and numeral pennants. Open the page, drop your input, get the result — typically under a second.
Your goal is calculate speed in knots from distance and time, or time from speed. Same approach: paste in, get the result, move on. No account, no upload.
Both tools live in the same category, so the choice depends on the exact subtask. Nautical Flags focuses on reference for international code of signals: alphabet flags and numeral pennants; Knots Calc focuses on calculate speed in knots from distance and time, or time from speed. Try whichever description matches your goal more closely — they're both free.
Yes — both tools are free for unlimited personal use. The Pro plan unlocks higher limits and batch features but the core functionality stays free forever.
Absolutely. Many users chain multiple tools together — process a file with one, then feed the result into another. Nothing is uploaded, so chaining is essentially instant.
No. Both Nautical Flags and Knots Calc work without signup. We only ask for an email if you decide to subscribe to a paid plan.