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 Navigating in Fog		  New Topic  Topic Locked
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Stinkpotter
Master Marine Consultant

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Djibouti
9013 Posts
Initially Posted - 08/25/2016 :  05:51:50  Show Profile
So as not to further hyjack the GPS thread that turned into a fog thread, I'll post this new piece from Sail here. Noteworthy points, I think, are the use of the VHF, sound signals, and contour lines on the depth sounder (as Chuck Shaw described in the other thread).
Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired),
Now on Eastern 27 $+!nkp*+ Sarge

dasreboot
Admiral

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803 Posts
Response Posted - 08/25/2016 :  07:25:52  Show Profile  Visit dasreboot's Homepage
i was thinking or making an automated foghorn based on a marinized electric horn and an arudino for timing. probably will never needit, but you never know.
Todd Lewis
Eowyn 87 TR/WK C25 #5656
ARWEN 84 TR/SK C25 #4031
www.mainsailsailingschool.com
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Voyager
Master Marine Consultant

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USA
5231 Posts
Response Posted - 08/25/2016 :  12:53:34  Show Profile
I like the Arduino concept for a foghorn but this being a marine environment and me being an EE hardware guy, why not use a dual 555 timer? It's about $1.50
It can gate the foghorn to blow for 2sec each 60 seconds and if it gets affected by the salt air, you can just chuck the timer and spend another $1.50
Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT
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Voyager
Master Marine Consultant

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USA
5231 Posts
Response Posted - 08/25/2016 :  17:49:55  Show Profile
Fog - thick fog - like < 50ft visibility is nearly impossible to handle. I had an experience with it one Sunday morning when I knew there were only a few boats out. I used my charts and GPS to track my movements and blew my horn once per minute. I tracked around the local shoreline and an island and shoals about 1-2 miles out.
When the fog finally lifted I found myself at a point 1/3 opposite the island that I thought I should have been. Scared the schist out of me once I retraced my track on a chart.
All I can say is I'd rather be lucky than good!!!
Fog is the test of a sailor!
Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT
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dasreboot
Admiral

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803 Posts
Response Posted - 08/26/2016 :  03:42:01  Show Profile  Visit dasreboot's Homepage
quote:
Originally posted by Voyager
why not use a dual 555 timer? It's about $1.50

cuz I'm a sysadmin who can code, not an EE. dont forget 2 long for power vessel not making way, and sailing vessel making way (1 long 2 short)
Todd Lewis
Eowyn 87 TR/WK C25 #5656
ARWEN 84 TR/SK C25 #4031
www.mainsailsailingschool.com
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dalelargent
Navigator

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USA
198 Posts
Response Posted - 08/26/2016 :  09:23:35  Show Profile
I had my first taste of real fog this summer in the San Juans. Getting ready to leave our mooring ball, we saw a fog bank a few miles North and moving South. We were heading south, so decided to push off and try to stay ahead of it...hoping it was slow moving and/or would dissipate prior to reaching us.

By the time we reached the channel and set sail, the fog was right behind us. We chose to drop sail and motor back to bouy and wait it out.

By the time we dropped sail, we were in full fog. Started motor and I, on the helm, reversed course while my mate changed screens on the gps so we could back-course to the mooring.

I executed my 180 (without aid of compass as the mate was blocking my view...I just guessed based on intuition, knowing I could make final adjustments once gps was on the "course" screen.

Done. Mate calls out, "ummmmmmm. You did an exact 360!"

Wow.

I already knew the seriousness of fog, but the experience brought the knowledge to a whole new level, if you know what I mean.

Nature is so humbling.

Btw, I think my fog horn going off automatically would scare the crap out of me every time! Lol!
1989 c25 WK/TR #5838
1998 Catalina 36 mkii
1983 Vagabond 14
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.