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Old 22-03-2014, 19:46   #1
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Navigating without GPS

If I looked at a map and wanted to go 180 degrees magnetic south from point A to point B across a body of water where the distance was far enough that I would loose site of land and I didn't have a GPS, only a compass and I was sailing into a head wind that caused me to tack back and forth how would I know how to get to point B. Also assume a cross current. This is likely a stupid question but I have never sailed where I couldn't see land and I would like to try it this summer. I'm not talking about sailing across the ocean but Great Lake sailing.
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Old 22-03-2014, 19:52   #2
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Re: Navigating without GPS

dead reckoning ,a speed log and a clock together with the compass , a chart with tidal vectors,and a set of tide tables and you are good to go.
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Old 22-03-2014, 21:02   #3
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Re: Navigating without GPS

And a navigation class.
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Old 22-03-2014, 21:13   #4
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Re: Navigating without GPS

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Originally Posted by atoll View Post
dead reckoning ,a speed log and a clock together with the compass , a chart with tidal vectors,and a set of tide tables and you are good to go.
don't think tide tables are on the list of things needed.sailing is not the sort of thing you predict on for arriving, maybe in a day if the weather is good
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Old 22-03-2014, 22:01   #5
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Re: Navigating without GPS

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don't think tide tables are on the list of things needed.sailing is not the sort of thing you predict on for arriving, maybe in a day if the weather is good
Tide and current tables (published together) are among the required publications for sailing in Canada.
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Old 22-03-2014, 22:04   #6
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Re: Navigating without GPS

Atoll and Jammer have it right.

Start with a set and drift solution.

Using dead reckoning and estimated position based on current at each tack .
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Old 22-03-2014, 22:08   #7
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Re: Navigating without GPS

Hey guys,

Remember that he is talking about Great Lakes sailing. Don't think that tidal currents are much of a factor in those bodies of water, so give the poor lad a break.

Compass, log and a timepiece should allow a decent DR to be plotted.

Cheers,

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Old 22-03-2014, 22:21   #8
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Re: Navigating without GPS

Haven't we had the conversation about tides and currents in the Great Lakes before?
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Old 22-03-2014, 22:22   #9
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Re: Navigating without GPS

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Haven't we had the conversation about tides and currents in the Great Lakes before?
Dunno, mate... just thought that I would point that out to the nav wallahs that were getting a bit over the top with fine tuning a simple request for basic info.

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Old 22-03-2014, 22:25   #10
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Re: Navigating without GPS

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Originally Posted by Jammer Six View Post
And a navigation class.


It is not, as the OP feared, a stupid question. But it is one which any sailor should know the answer to before getting out of sight of land. As are many other questions. I heartily recommend that you join either the Canadian or US Power Squadrons and take their series of (free) piloting and navigation courses. Then go cruising...

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Old 22-03-2014, 22:26   #11
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Re: Navigating without GPS

Or, a portable AM radio that you can use as a makeshift Radio Direction Finder (RDF).
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Old 22-03-2014, 22:53   #12
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Re: Navigating without GPS

Lots of Sail Canada schools in the Kingston vicinity

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Old 23-03-2014, 06:47   #13
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Re: Navigating without GPS

Thanks for all the replies. I think the best solution is for me to take a course. Thanks again.
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Old 23-03-2014, 09:26   #14
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Re: Navigating without GPS

I would simply use a glonass unit. Many smartphones do.

Or else you can use Gogle Maps with wifi positioning - provided you are in range.

b.
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Old 23-03-2014, 09:42   #15
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Re: Navigating without GPS

Using Dead Reckoning, I've learned to always be off course one way or another, that way when you hit land, you know for sure which way to turn
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