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  1. #51
    Join Date
    Sep 2001
    Location
    Me - Zumerzet Boat - Wareham
    Posts
    12,398

    Default Re: Does anyone still (a) use, and or (b) carry aboard, any or all of these?

    Quote Originally Posted by john_morris_uk View Post
    Who else carries a speed times distance calculator? https://www.seachest.co.uk/plotting-...culator-large/
    Yes, mine has a little Trade Mark Arrow on it
    MontyMariner.co.uk
    Facilitated by AWESEM WP Agency

  2. #52
    Join Date
    May 2012
    Posts
    435

    Default Re: Does anyone still (a) use, and or (b) carry aboard, any or all of these?

    Quote Originally Posted by laika View Post
    Is it true that if you drop an aubergine into water it always floats north-south?
    That's just an old wives' tale. But if you drop a Fray Bentos overboard, it will always show you the direction of the depth of water.

  3. #53
    Join Date
    Jul 2003
    Location
    River Itchen, Southampton
    Posts
    7,348

    Default Re: Does anyone still (a) use, and or (b) carry aboard, any or all of these?

    Quote Originally Posted by Scala View Post
    I carry and use...



    So not a lot.
    Nearly the same as me.
    I’d add stopwatch ( on my phone) for timing between hand bearing sights of ships cross channel. Even though AIS makes that redundant it makes me feel better.

    You’re the first one to say lead line.
    Essential for when you get on someone else’s boat to figure the offset. Only used it once on mine but it’s there ready to go.

  4. #54
    Join Date
    Oct 2012
    Posts
    3,288

    Default Re: Does anyone still (a) use, and or (b) carry aboard, any or all of these?

    Quote Originally Posted by davidjackson View Post
    I like to read threads like this one because they always throw up interesting tangents. I'm intrigued by Nories Tables.

    I did YM Ocean shorebased course with a retired Master Mariner (rather than a yacht sailor). He showed me the how to use the Traverse Table to derive a position from last DR, Course and Distance Traveled. It seems almost clumsy compared to drawing the track on a simple (to construct) Plotting Sheet. Similarly, the ABC method of sight reduction, found in the Tables, seems more complex than the more commonly used Marcq St Hilaire method.

    I have a 1963 edition in very good condition on my bookshelf so I've just blown off the dust and looked at the contents page.

    So a question to the more experienced; what did you use the Tables for and what use do they have on a coastal or ocean passage making yacht today?
    Only for us old pre calculator types.
    Primarily still use the ABC tables for a compass error. I can do it faster with the tables than I can with a calculator. Old guy thing, kind of like riding a bike.
    If I'm helping a youngster learn how. Even when they use calculators. Its often easier for me to figure out how they screwed up when things don't go right. Helps me figure out if its an error in principle or just arithmetical error or button pushing.

    The travers tables you mentioned. again I can figure out a DR, Distance run, Set drift, Even with co changes quicker and more accurately(eliminates plotting errors). I could do it by calculator. but TV tables are quicker for my old brain. Most younger guys just use calculators. AFAIK the schools teach by calculator now and so are the exams.
    Even doing it by calculator you still need to look up meridional parts for a Mercator sailing to calculate a rhumb line over 600m.
    Unless you know the formula for MP, its quicker to look them up in Norrie's. Or have it pre programed.

    The main part of the tables is for resolution of the haversine formula using logarithms. so no calculator needed just a pencil and a sight book. Again old guy thing. 40 years ago I could run through the whole thing in about 15 to 20 minutes. A sun run is just a running fix. Using the tables you can do it pretty quick and calculate your Noon position rather than Plotting it. It was just faster and easier, along with the elimination of plotting errors.
    I would even do morning or evening stars by logarithms, still had to plot those, but you run up the DRs probably doesn't matter if you are drifting along at 5 knots. If you are doing 15 or 20 it makes a difference. You take the first star you might have moved 5 miles by the time you take the last.
    Later I used short method tables to select starts and resolve by calculator, as what I found most efficient.
    Haversine also used to calculate great circles, composite great circles ect. for planning and reports.
    Just daily number crunching.
    I think I did a vertical angle last spring to show someone how. Again the table is there. or you can do it by calculator and simple trig. Its not something I did on a regular basis. I used and still use dipping ranges much more. again the Norrie's has the table. Bit archaic still works like a hot dam. Quick and easy. The Chanel was a favourite are for using it. Nice big lights watch the looms and take a bearing when they pop up you got a good position. One of the reasons I liked to make land fall at night. Its a technique I still use routinely. If you know dipping ranges of lights you will encounter.
    Norrie's has tables for ex meridians lat by Polaris all the moons corrections, actually all the Suns, Star and Planet corrections not just the total correction. Cant say I bothered with them unless it was just an exercise.

    One of the best uses is the explanation section at the front. You were allowed take your own copy into the dot exam room, It has all the formula and a reminder on how to do things if you have brain freeze.

    So permitted cheating or permissible open book for D.O.T exams was a primary function, provided you hadn't added any notes of your own.
    If you didn't have your own set of tables, the D.O.T would provide a set with the explanation section sealed or removed.

    All outdated 35 or 40 years ago. Still a published and a rather expensive test book.
    Who the heck would use logarithms today? Me?

    Do I carry a set on my boat? No its on a shelf at home unless pulled out for special occasions.

    Would I carry it if I went off on an ocean crossing? Of course, along with my sextant and the almanac. Save me taking all those other dam air tables.
    Not planning any oceans, I like to find a pub before closing time.
    Last edited by Uricanejack; 18-11-19 at 00:41.

  5. #55
    Join Date
    Nov 2011
    Location
    Sydney, Australia.
    Posts
    5,658

    Default Re: Does anyone still (a) use, and or (b) carry aboard, any or all of these?

    From the replies there is an interesting dependence on access to power. Many use their phone, or tablet, for many tasks - fine on short coastal passages - but possibly less reliable for longer passages.

    Jonathan

  6. #56
    Join Date
    Jul 2003
    Location
    River Itchen, Southampton
    Posts
    7,348

    Default Re: Does anyone still (a) use, and or (b) carry aboard, any or all of these?

    Quote Originally Posted by Neeves View Post
    From the replies there is an interesting dependence on access to power. Many use their phone, or tablet, for many tasks - fine on short coastal passages - but possibly less reliable for longer passages.

    Jonathan
    If you are thinking of undertaking a longer passage without reliable power you need to sort your boat out.

  7. #57
    Join Date
    Nov 2011
    Location
    Sydney, Australia.
    Posts
    5,658

    Default Re: Does anyone still (a) use, and or (b) carry aboard, any or all of these?

    We have reliable power, 2 x 20hp engines, 1 x wind/water gen (10amp @ 10 knot), approx 100amp/day solar and we make long passages (if 500nm is considered long) - and I would not rely on a phone or tablet for any critical applications.

    Jonathan

  8. #58
    Join Date
    Jul 2002
    Location
    Farnham, Surrey
    Posts
    21,519

    Default Re: Does anyone still (a) use, and or (b) carry aboard, any or all of these?

    Quote Originally Posted by Elessar View Post
    Youíre the first one to say lead line.
    Iím slightly confused by your comment as way back at replies #6 and #7 etc people (including me subsequently) were admitting to having a lead line on board.
    Semper aliud

  9. #59
    Join Date
    Jan 2004
    Location
    Med
    Posts
    6,271

    Default Re: Does anyone still (a) use, and or (b) carry aboard, any or all of these?

    Quote Originally Posted by john_morris_uk View Post
    Iím slightly confused by your comment as way back at replies #6 and #7 etc people (including me subsequently) were admitting to having a lead line on board.
    John has full time cruiser we don't have a lead line on board , I think the last time I had one was some 30 years ago , but it would take me about min to make one if I had to , out of a length of string and a small spider anchor which Was last used some three years ago to get through one of the uncharted channel in the lagoon in Venice.
    I think the equipment given in the OP posting depend greatly on the type of Sailing you do, example , would the weekend sailor carry a sextant and tables?,
    in our case we wouldn't carry tide tables as there no point in the Med.
    again signel flags other them making your boat look pretty these days what's the point.
    Even if you did have to use them most wouldn't know what they meant,
    Most cruisers we met these days are expert at setting up their plotters and putting in way points but it stop there.
    We had two couple on board for dinner the other weeks and while looking for some thing in my chart table I pulled out my plotter and was ask by both parties what it was used for, at first I thoughts they where pulling my leg.
    Last edited by sailaboutvic; 18-11-19 at 07:33.
    Warning forumite dyslexia near by
    www.bluewatersailorcroatia.webs.com

  10. #60
    Join Date
    Apr 2005
    Location
    Shoreham - up the river without a paddle.
    Posts
    1,252

    Default Re: Does anyone still (a) use, and or (b) carry aboard, any or all of these?

    You can still get canned cheese in India. Not sure about the butter though.

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