4 articles in this category
Every skipper has a story about the day the GPS blinked. Maybe a ferry woke up fifty meters off its berth. A fishing boat ran hard aground on a shoal ...
Dead reckoning is the oldest backup for GPS. But the log-only version—speed through water, steer a compass course, plot a chain—has a snag: it ignores...
Where Error Bounds Fail First Groundings happen when the position uncertainty exceeds the available water. That sounds obvious. But the standard pract...
Your last fix was 4 hours ago. You are staring at a chart, a logbook entry, and a growing unease. The sun is lower, the wind has shifted, and that pen...