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Tom Tersey, owner and instructor at Maryland School of Sailing, argues that GPS dependency has made modern sailors blind to environmental navigation cues that ancient and post-WWII sailors relied on — and explains how to recover those skills.0:53 He covers reading Gulf Stream entry by cobalt-blue water color and temperature change, identifying proximity to land through floating vegetation and bird species, and using cloud formations over islands as position indicators.1:56 For post-WWII techniques, he details dead reckoning with compass, speedometer, and paper chart, explaining why a speedo measures speed through water while GPS measures speed over ground, and why the difference matters for DR plotting.12:38 He explains danger bearings as an imaginary fence between the vessel and a hazard, useful for compensating leeway and current when passing obstructions.10:22 Compass calibration and deviation tables are flagged as neglected but essential steps before any non-electronic passage.11:55 The Beaufort scale gets attention as a practical tool for reading wind speed from sea state rather than instruments.40:55 Tersey advocates mounting the chart plotter at the nav station below rather than on the binnacle, so the helmsman watches the water.31:32 A lightning strike that killed all electronics on a Maryland School of Sailing boat — leaving the crew without depth sounder — illustrates why situational awareness must run parallel to electronic navigation at all times.28:11

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