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Two marine & boating tools, side-by-side. See which fits your task.
Marine & Boating
Calculate theoretical hull speed from waterline length for displacement vessels.
Open Hull SpeedMarine & Boating
Reference for lighthouse types: fixed, flashing, and sector light characteristics.
Open Lighthouse TypesYour specific task is calculate theoretical hull speed from waterline length for displacement vessels. Open the page, drop your input, get the result — typically under a second.
Your goal is reference for lighthouse types: fixed, flashing, and sector light characteristics. 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. Hull Speed focuses on calculate theoretical hull speed from waterline length for displacement vessels; Lighthouse Types focuses on reference for lighthouse types: fixed, flashing, and sector light characteristics. 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 Hull Speed and Lighthouse Types work without signup. We only ask for an email if you decide to subscribe to a paid plan.