Use transits to check compass error

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Transits are not only used to determine your position line, they can also be used to check your compass error.
On your chart, look for two objects in line.
As you already know, transits can be man-made objects or natural ones.
So, the two objects can be two beacons, two buoys, a building and a light house, or other objects.
With your parallel ruler, determine the True Bearing of the transit and make a note of it.
In this case the True Bearing is 115 degrees.
Now point the bow of your boat towards the two objects.
When they come in transit, make a note of your Compass Bearing, which in this case is 120 degrees.
As the Compass Bearing is more (best) than the True one, the error is West.
To memorize that, remember: Compass best error West, Compass least error East.
To find the error, subtract 120 degrees Compass from 115 degrees True).
The Error of our compass is 5 degrees West.

[@user-um9iq2xf3j]

The fact that my school cannot teach me this kind of navigation. They always put complicated explanation. thanks sir for sharing

[@josephlai9759]

Thank you for sharing. I just want to add that viewers need to know there is True Bearing (from True North) and there is also Magnetic Bearing (from Magnetic North). The question is: are we checking the error of a Gyro Compass or a Magnetic Compass on the boat? The calculation will be different.

[@guraabfsm435]

I love this channel.
great works done, thanks

[@user-pi2fj6xs6q]

Hi sir, wow, your channel contents are truly and deeply helpful, I appreciate for that. Have a safe voyage

[@rheinx1754]

what are the advantages and disadvantages of it ?

[@VinaySingh-vb9lz]

Nice explanation 👍🏻

[@johncampbell388]

How did you set your compass to true instead of magnetic. Or did you mean magnetic not true when you read off the compass rose on the chart?

[@nilkanthtandel7222]

It's good helpful

[@soytv5654]

di ko gets 😭😭

[@allenlark]

why not just go by the asimuth. subtract 5° from your compass measurement. no need for the west/east thing.

[@fr4nkals671]

You can’t use buoys as object of bearing because they could move from their position in the chart due to the slack of its anchor chain and current pushing them

[@skippercheck_net]

So its not perfectly precize, but its better than nothing. Its quite ok

[@fr4nkals671]

Nothing???? Did you know you can use astronomical body to correct your compass? Azimuth, amplitude method? When there’s no sighting of land objects? I don’t know how you get licensed to issue certificates for mariners but I bet it’s non STCW compliance. Because if you ignoring precision when sailing, setting course with 1-2 degrees error for long run without correcting it, you may end up with your boat on the rock in the middle of the ocean.