Juan Nicholo

04/04/2026

Black Saturday, day before Easter.

Tara at mag sign-off sa Malaysia

full video 🔗 👇
https://youtu.be/Fv_k0Gzlzjs?si=_JuZh9JHTYSzrrno

Ps. Late upload😁

02/04/2026

02/04/2026

The Petronas twin tower

02/04/2026

sum souvenirs to bring home

02/04/2026

Airport blues

02/04/2026

Vibrant New World Suites at Bintulu, Malaysia

02/04/2026

Glasses on Sarawak

02/04/2026

Marine Sextant

A double reflecting nav instrument used to measure the altitude of a celestial body above the visible horizon.

As a scale of a sextant is 60, 1/6 of a circle. Hence the name sextant. Double reflection principle allows it to measure angle up to 120°

Working Principle: Double Reflection

To understand how this instrument achieve such high accuracy, it is helpful to know its primary structural parts.

02/04/2026

Ola mga kabyaheros and every'Juan.
A new learnings another day na naman.
For today's Cadet's Workplace post is all about the...

Marine Sextant

A double reflecting nav instrument used to measure the altitude of a celestial body above the visible horizon.

As a scale of a sextant is 60, 1/6 of a circle. Hence the name sextant. Double reflection principle allows it to measure angle up to 120°

Working Principle: Double Reflection

To understand how this instrument achieves such high accuracy, it is helpful to know its primary structural parts.

1. Graduated Arc
Curved bottom of the frame marking degrees where the final measurement is read using
and .

2. Index Arm
The moving part that pivots at the center of the instrument.

3. Index Mirror
Fixed to the top of the index arm which reflects the image of a celestial body down to the

4. Horizon Glass.
A half-silvered mirror that serves as the meeting point of your two visual references.

5. Micrometer Drum
A rotating drum adjustable to the index arm that allows for increasing fine readings.

6. Vernier Scale
A fixed scale beside the drum used to read decimal fraction of a minute for maximum precision.

7. Index Mirror Filters
Semi-opaque glass discs of varying densities used to reduce the Sun's brilliance. Allowing the navigator to clearly align the celestial body with the horizon.

8. Horizon Glass Filters
Tinted glass shades positioned in front of the 4.Horizon Glass reduces the Sun's glare to safely sight the body with the horizon.

9. Lighting Unit
A small button designed to Illuminate the arc during night observation. Allowing the navigator to read a celestial altitude in lower light conditions.

10. Quick Release Clamp
Spring loaded trigger mechanism located on the that allows a navigator to disengage.

11. Handle
Sturdy grip, mounted to the frame that allows the navigator to hold the instrument steadily.

12. Adjusting Screw
Used to calibrate the and eliminate instrumental errors.

13. Telescope
Optical sighting device mounted to the frame that sights and magnifies the horizon and the celestial body.

31/03/2026

Panglima sa mga ganap pag walang pasok ang mga tropa.

26/03/2026

always had something for waves

24/03/2026

☀️GYRO ERROR CALCULATION

-This video is a step-by-step process of determining the difference between the heading or bearing indicated by a ship's gyrocompass and the True Heading/Bearing.

Nautical Almanac 📘
From getting 🕰️ LHA - Local hour angle to
Norie's Table 📗ABC table
and finally getting the error

Derived from a celestial body reference that be the Sun.