The exercise page, titled – LA ROCHELLE – provides simulated sextant sun sighting observations, replicating those commonly performed at sea off the coast of LaRochelle.
This is the most crucial page on this website, particularly if you are determined to master the skill of finding your position at sea without relying on GPS.
The objective is to complete the blank worksheet by recording the relevant data on this page, calculate the outcome with the help of the interactive worksheet and subsequently plotting the resulting line of position (LOP) onto a plotting sheet.
This page “La Rochelle” will guide you to the interactive worksheet.
Hence, these two pages contain all the links to theoretical explanations and instructions on how to calculate and fill out the blank worksheet, serving as the two cornerstone pages of this website
– LA ROCHELLE – PLEASE NOTE
To begin, print or copy the worksheet by hand.
Keep in mind that mastering the La Rochelle exercise will require more than a couple of hours.
As a matter of fact, it may take several days to familiarize yourself with the celestial language and successfully complete the exercise independently.
And this will take time, an experience shared by every student at the naval school.
Persevere with the La Rochelle exercise until you can effortlessly complete it within 30 minutes.Once accomplished, I hope you will find the remaining exercises enjoyable and challenging
Download blank worksheet for scientific calculator or copy by hand.
After downloading or copying the worksheet by hand, we can start the exercise by completing the red entries on this page.
First, we will start completing the red entries.
1 Sextant height (Hs).
2 The UT time / DATE at the time of our observation.
3 Index error.
4 Non-adjustable error.
5 Height of the eye above the sea.
6 Estimated Latitude (L); Longitude (G).
7 GHA, the sun’s Declination, and d for the whole UT hour.
– LA ROCHELLE -INSTRUCTIONS
For each entry, you will find two links.
In fact, the first link will provide a theoretical explanation of the entry, and the second link will allow you to check your answer.
1
sextant height (Hs)
Lower limb
lower limb
Click on this link to check your answer.
2
Date and Time UT of the observation
Click on this link to check your answer.
3
Click on this link to check your answer.
4
Click on this link to check your answer.
5
Click on this link to check your answer.
6
Latitude (L) :
46° 12′ North
Longitude (G) :
004° 31′ West
Click on this link to check your answer.
7
– LA ROCHELLE -The nautical almanac page
GHA and D
Note the GHA and Declination for the whole 10 UT hour; this will be explained in the interactive worksheet afterwards.
Daily pages can be downloaded on the nauticalalmanac.it website: author Capt. Roberto Iori
Click on this link to check your answer.
– LA ROCHELLE –
the red entries answers.
After the sextant sun sight and completing the red entries we check if we did not make any mistakes.
I suggest downloading or printing the completed La Rochelle worksheet PDF or copy by hand before moving on to the interactive worksheet.
Therefore, utilize the instructions offered by the interactive worksheet, which includes a theoretical note and a separate note on how to compute the different outcomes at each stage.
– LA ROCHELLE -Click the red button of your choice now. (see below)
Highly recommended for both general use and beginners
This ancestral option is not recommended to start with.
Logarithm and azimuth tables
Finale of the La Rochelle content.
Reminder
– LA ROCHELLE -The Importance of Persistence and Effort in Achieving Progress
As you begin with this site, it’s crucial to keep in mind that it may not provide an immediate solution to all of your problems.
Therefore, it’s essential to set realistic expectations and understand that working through the worksheet will take effort and time on your part.
Nevertheless, with dedication and persistence, you will eventually see progress. In fact, it’s natural to want to see results quickly, but it’s important to remember that any significant change takes time.
Moreover, as you work through the exercises, you may encounter challenges or feel frustrated at times. Consequently, don’t be discouraged if you don’t see progress right away; it’s all part of the process.
However, with dedication and persistence, you will eventually see progress.
It’s natural to want to see results quickly, but it’s important to remember that any significant change takes time.
