Backup navigation with iPhone — sensible or risky?
When backup navigation with iPhone makes sense — and when it becomes risky.
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Knowledge for the bridge
Navigation, the course chain and sailing offline — concise articles linked to NauticCalc tools.
Keeping a logbook: duty, habit or convenience?
Why a logbook pays off — and how digital logging on iPhone helps.
Read more →Reading tides: HW, LW and time windows for harbour manoeuvres
Understand HW and LW and plan harbour work — with offline or live tides in NauticCalc.
Read more →Offline tides vs. live tides: what skippers need to know
When offline tides are enough — and when you need a WorldTides key.
Read more →Calculating ETA when sailing: distance, speed, departure
How to plan arrival and passage time in a traceable way — with realistic speed.
Read more →Passage time vs. ETA: typical mistakes on a leg
Why arrival time is wrong — and what to check before you leave.
Read more →Course correction step by step (with current)
From chart course to compass: the course chain and allowances in five clear steps.
Read more →Current triangle: course and speed from set and drift
Set and drift made clear: when you need the current triangle and how it fits course correction.
Read more →What is magnetic variation — and why it changes your compass course
Why the compass is not “the truth”: variation, deviation, and the course chain from rwK to steering course.
Read more →rwK, mwK, and MgK: the course chain for sailors explained
From chart course to steering compass: rwK, mwK, MgK and allowances — the basis of course correction.
Read more →Sailing without internet: what really works offline
No mobile signal on board? What NauticCalc really does offline — and where you need a network or your own API keys.
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