Black Panther 1,641 Posted June 10 Share Posted June 10 You are sailing in zero visibility. You need to pass a big outcrop of coral to port then turn 90 deg port. What navigation tools do you have and how close will you get and still be comfortable? Closer cuts time off your trip, farther off means less chance of hitting the coral. Quote Link to post Share on other sites
Jon 375 Posted June 10 Share Posted June 10 Firstly we’re in the tropics are you ? Some chart data is very unreliable and other isn’t, plus is it fog or just dark night ? And have I been there before ? Stand off until daylight. Or use satellite imagery data, radar, chartplotter, navionics on another device, in other words all available means including someone on the bow as you can always see or hear something no matter how dark the night is. Quote Link to post Share on other sites
Nathan1000 2 Posted June 11 Share Posted June 11 Open CPN with a good satellite image. As good as good visibility. 1 Quote Link to post Share on other sites
Island Time 1,276 Posted June 11 Share Posted June 11 Open water ie clearing an island, 3-5 NM, depending on area and chart reliability. Use radar to get distance off if there is anything above the surface, or breakers. If in enclosed waters, and I have to move, all available means - chart, Sat pics, different chart, radar, sonar and forward scan. Proceed really slowly. If 3 separate systems do not agree with my fix, I'm not moving! 1 2 Quote Link to post Share on other sites
Black Panther 1,641 Posted June 11 Author Share Posted June 11 Sorry, been away. I based it on an actual passage so, tropics, zero visibility, never been there before. No right or wrong here, just interested what other people would consider acceptable. Quote Link to post Share on other sites
Black Panther 1,641 Posted June 11 Author Share Posted June 11 Depth sounder pretty useless as deep water right up to the coral. How far ahead can the forward scan "see".? Coral so very little above sea lever - breakers and some palm trees a mile or so inside the reef Quote Link to post Share on other sites
Island Time 1,276 Posted June 11 Share Posted June 11 Radar can see the breakers and the palm trees, and the land the trees are on, so will give you a very good chart position check if overlay is used. But on a passage my planning is 3-5nm... Oh, and fwd scan only out to about 150/200m at best, great for poking into a bay or entry... Quote Link to post Share on other sites
harrytom 666 Posted June 11 Share Posted June 11 15 hours ago, Black Panther said: You are sailing in zero visibility. You need to pass a big outcrop of coral to port then turn 90 deg port. What navigation tools do you have and how close will you get and still be comfortable? Closer cuts time off your trip, farther off means less chance of hitting the coral. Whats the old saying? " If in doubt stay out" 2 Quote Link to post Share on other sites
K4309 320 Posted June 11 Share Posted June 11 On 11/06/2024 at 7:49 AM, Black Panther said: You are sailing in zero visibility. You need to pass a big outcrop of coral to port then turn 90 deg port. What navigation tools do you have and how close will you get and still be comfortable? Closer cuts time off your trip, farther off means less chance of hitting the coral. You didn't say if this was a charter boat or not? This is known to greatly influence the risk profile and level of caution taken 3 Quote Link to post Share on other sites
Guest 108 Posted June 11 Share Posted June 11 Whether you drown your friends or just customers? Quote Link to post Share on other sites
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