The VHF antenna was on the masthead — it is gone. The chartplotter was powered through a mast-mounted connection and is now dead. What navigation capability remains?

A. Use the AIS transponder for navigation — it shows all vessel positions including own-ship

B. Assess remaining capability: handheld VHF (if carried) has reduced range (~3-5nm) but still works; smartphone GPS navigation apps work independently of the chartplotter; paper chart and compass provide primary navigation; depth sounder (through-hull) still works; AIS (if separately antennae) may still work. The lesson: never have a single point of failure for navigation or communication — carry a handheld VHF as backup

C. The vessel must anchor immediately — proceeding without chartplotter is unsafe

D. Without the masthead VHF antenna, all communication with the Coastguard is impossible — deploy EPIRB

A. Action 1: call "MAST DOWN — ALL HANDS — GET CLEAR" immediately — crew clear of falling rig (mast, boom, and rigging wires striking crew is the primary injury risk). Action 2: put helm hard over to head into wind (reduces apparent wind loading on the collapsing rig). Then immediately: engine start, assess crew safety, assess hull damage

B. Action 1: try to grab the falling mast to control it. Action 2: bear away to reduce speed

C. Action 1: start the engine. Action 2: deploy the liferaft

D. Call Mayday immediately on Ch16 — then address the rig

A. The main danger is that the sails will continue to fill — the rig should be re-raised immediately

B. The rig in the water is stable — it reduces rolling and can be left while the Mayday is transmitted

C. The only danger is to other vessels — the rig is a collision hazard and must be lit with a flare

D. Danger 1: the rig acts as a sea anchor — it will pull the vessel beam-on to the seas and risk capsizing or swamping. The mast can also hole the hull where it contacts the topsides. Danger 2: the rig entangles the propeller — if the engine is engaged before clearing or securing the rig, the shaft may be fouled or bent, removing propulsion entirely