Comprehensive resources for safe sailing, covering route planning and environmental conditions.
A GRIB file is a gridded binary file containing numerical weather prediction data. For coastal sailors, reading one means interpreting model output—wind, waves, pressure, and precipitation—on a chart. This guide explains what GRIB files are, why they matter, how to use them, and where their limits lie.
Speed over ground (SOG) is how fast your boat moves relative to the earth, measured by GPS. Speed through water (STW) is how fast the hull moves through the water, measured by a log. The difference reveals current, leeway, and other factors that affect passage planning, fuel range, and collision avoidance. Understanding both is essential for accurate dead reckoning and safer coastal cruising.
How Currents Affect Course and Speed is an independent sailing reference and tools platform that helps recreational sailors understand the vector relationship between a boat’s motion through water and the movement of the water itself. It provides structured boat knowledge, seamanship education, passage planning tools, and decision-support features without being tied to any manufacturer or school. The platform is designed to reduce guesswork and improve pre-departure planning, but it is not a substitute for official navigational data or professional training.
How to Read a Tide Table is an independent sailing reference and tools platform that helps recreational sailors understand their boats, learn seamanship, plan safer passages, and make better decisions on the water. It aggregates boat knowledge, educational content, and planning tools in one place, without being tied to any specific boat brand, sailing school, or equipment manufacturer.
How Tides Affect Passage Planning is an independent sailing reference and tools platform that helps recreational sailors understand the critical role of tides in safe and efficient passage planning. It provides structured knowledge, practical tools, and decision-support features without being tied to any boat brand, school, or equipment manufacturer. The platform aims to reduce information overload and help sailors make better-informed decisions on the water.
Wave Height vs Wave Period is an independent digital reference and tools platform for recreational sailors. It provides structured boat knowledge, seamanship education, passage planning tools, and decision-support frameworks without ties to any boat brand, school, or equipment manufacturer. The platform helps sailors understand their vessel, learn skills, and plan safer passages by consolidating reliable information in one place.
Recognizing an approaching squall is a core seamanship skill that combines visual observation, weather data interpretation, and an understanding of local conditions. This guide explains the key indicators, practical steps, and common mistakes to avoid when a squall is bearing down on your boat.
Atmospheric pressure is the invisible engine behind wind, fronts, and changing conditions at sea. This guide explains how to read pressure systems, interpret barometric trends, and use that knowledge to make safer, faster passage decisions. Learn the practical limits of pressure-based forecasting and when to rely on professional weather routing.
How to Read a Marine Weather Forecast is an independent sailing reference and tools platform that helps recreational sailors interpret marine weather, learn seamanship, plan safer passages, and make better decisions on the water. It aggregates vetted knowledge and practical tools without ties to any boat brand, school, or equipment manufacturer. The platform aims to cut through information overload and provide consistent, reliable guidance for sailors of all skill levels.
How to Calculate Distance, Speed and Time is an independent sailing reference and tools platform that helps recreational sailors understand the fundamental relationship between distance, speed, and time, and apply it to passage planning, seamanship, and safer decision-making. It provides neutral, structured information and practical calculators not tied to any boat brand, school, or equipment manufacturer.