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Old 07-26-2019, 08:52 AM   #41
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Looking at three charts, NOAA raster, NOAA vector and Navionics there are clearly 3 hazards in the area of Sisters rocks. Only one is marked, the southern Sisters rock. Unmarked are the northern Sisters rock and two rocks to the NW of the unmarked Sisters rock.

Looking out for aids to navigation is important, but it's not enough. We still need to study our charts...


Remember to zoom in on electronic charts, especially when near marked hazards.

Reminds me of the Volvo Ocean Race, when one of the multi million dollar yachts with world class sailors aboard was destroyed by hitting a reef at night.

We spend quite a bit of time close to rocks photographing seals and birds, and there can be some significant differences between what the electronic chart says (even when zoomed in) and what the depth sounder says.
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Old 07-26-2019, 09:30 AM   #42
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Remember to zoom in on electronic charts, especially when near marked hazards.

Reminds me of the Volvo Ocean Race, when one of the multi million dollar yachts with world class sailors aboard was destroyed by hitting a reef at night.

We spend quite a bit of time close to rocks photographing seals and birds, and there can be some significant differences between what the electronic chart says (even when zoomed in) and what the depth sounder says.
Murray, it's also a little reminiscent of that BC ferry that banged a rock and sunk up your way. Was it at the lower end of Grenville channel?
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Old 07-26-2019, 09:35 AM   #43
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Remember to zoom in on electronic charts, especially when near marked hazards.
Nothing illustrates and reinforces that comment by MurrayM, than this bit by Sam Landsman. Scroll down to the fourth picture and accompanying comments.

Safe Harbour: Alaska 2016 | Day 12 | Ocean Falls Wigham Cove
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Old 07-26-2019, 09:39 AM   #44
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Murray, it's also a little reminiscent of that BC ferry that banged a rock and sunk up your way. Was it at the lower end of Grenville channel?
Yup...apparently due to an inadequate watch during shenanigans on the bridge.
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Old 07-26-2019, 10:49 AM   #45
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Yup...apparently due to an inadequate watch during shenanigans on the bridge.
In the QOTN (ferry) incident, there was no excuse of a bad charting program available. One officer was fired and sentenced to 4 years in jail for Criminal Negligence causing death.

I have both Navionics and CAPN (using Canadian Hydrographic raster charts). Autorouting on the Navionics is handy, but those charts are no match for the real thing on my CAPN. I wouldn't trust the Navionics, except in the dinghy, where the consequences are somewhat reduced if they do take you on to a rock.
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Old 07-26-2019, 11:57 AM   #46
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Most boats navigate between the Sisters Shoal and the shallows north of it. The channel is wide and deep enough for passage.
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Old 07-26-2019, 03:34 PM   #47
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Remember to zoom in on electronic charts, especially when near marked hazards.

Reminds me of the Volvo Ocean Race, when one of the multi million dollar yachts with world class sailors aboard was destroyed by hitting a reef at night.
That's where the latest split screen version of opencpn is great.
One half of the screen zoomed out and the other zoomed in, both showing vessel position .



https://opencpn.org/OpenCPN/about/ver500.html
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Old 07-26-2019, 04:08 PM   #48
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Wow...just saw that split screen on OpenCPN....sweet....gonna take a really different chartplotter to get me off OpenCPN.
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Old 07-26-2019, 07:06 PM   #49
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That's where the latest split screen version of opencpn is great.

One half of the screen zoomed out and the other zoomed in, both showing vessel position .







https://opencpn.org/OpenCPN/about/ver500.html

One of the reasons I use a vertical split screen on one of my MFDs. One is zoomed in and the other gives a more general view.
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Old 07-26-2019, 07:15 PM   #50
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Another tidbit of info that I got from the reporter covering the sinking and recovery. The owner did say that there was 300 gallons of fuel on board. That is what the salvage crew prepared for. The largest tank they could get was 150 gallons. Divers when down and pumped the fuel into the tank on the dive boat and then ran it 45 minutes round trip to dump it. Turns out that there was actually 650 gallons of fuel on board so it took 5 trips to dispose of the fuel. Don’t ask me how they actually did it, I don’t know.
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