Free LEARNING MATERIAL 17 · Episode 05 & 08 Companion | OFFSHORE / BLUEWATER

An ungrounded mast doesn't just risk your electronics. It can sink your boat.

Learn how a properly engineered ABYC E-4 lightning protection system creates a Cone of Protection — and how to audit yours before you cross an ocean.A 5-phase implementation roadmap from ‘shore power dependent’ to ‘anchor anywhere for weeks’ — with specific products, timelines, and realistic cost ranges at each phase.

Why This Is a Survival Issue — Not a Nice-to-Have
A lightning strike can exceed 30,000 Amperes. Without a dedicated ground path, that charge ricochets through your cabin seeking the sea — through your wiring, your stays, your plumbing. If it encounters an unbonded thru-hull, the resulting heat can vaporise the fitting and flood the vessel. Offshore, this is a total-loss event.
lm17 offshore lightning protection blueprint

What's Inside

✓ How the Cone of Protection works — and the 45–60 degree rule
✓ ABYC E-4 hardware requirements — conductor gauge, ground plate size, air terminal spec
✓ The 6-foot bonding radius rule — why side flashes kill and how to prevent them
✓ Installation criticals — why 90-degree bends create lethal arc-over points
✓ 8-point pre-departure audit checklist — sign off before your next passage 
✓ Thru-hull vaporisation explained — the mechanism behind most lightning sinkings

THIS IS FOR YOU IF

→ You’re preparing for a bluewater crossing or offshore passage and haven’t verified your lightning protection
→ You have a mast-mounted system but aren’t certain it’s properly bonded and grounded to ABYC E-4
→ You want to understand the physics — not just follow a checklist blindly — so you can make smart decisions at sea

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