How to practically construct a Deviation Card for the ship's magnetic compass??

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In this video, I explain the practical procedure of constructing a deviation card for the ship's magnet compass and the practical considerations to bore in mind while doing so.

Contents of this video will benefit mariners preparing for exams (written and oral examinations).
Mariners will also benefit by watching the following videos:
Magnetic anomalies: https://youtu.be/RVP_z_P5vwY
Ship's magnetism: https://www.youtube.com/watch?v=RffiU4Q7vXE&t=134s
Earth's magnetism: https://www.youtube.com/watch?v=8VIqsIEwbRI&t=60s
Deviation of the magnetic compass: https://www.youtube.com/watch?v=YX2cblelL1M&t=235s
Magnetism (an introduction): https://www.youtube.com/watch?v=X0caJUWPVrA&t=99s
Parts of a magnetic compass (Video): https://youtu.be/KXJbIpis87s

Gyro Compass (Part 1): https://www.youtube.com/watch?v=4mD6fHYQ694
Gyro Compass (Part 2): https://www.youtube.com/watch?v=bvO4froSGSc&t=57s
Gyro Compass (Part 3): https://www.youtube.com/watch?v=DDmf-rogI40&t=36s
Gyro Compass (Part 4): https://www.youtube.com/watch?v=wrsd6WrdCsA&t=3s
Gyro compass errors (Part 5): https://youtu.be/BJlS2iup-oo
Gyroscope (Axis of freedom and Precession) (Part 6): https://youtu.be/dddEF87QK2o
Parts of a Gyro Compass (Part 7): https://youtu.be/tmmsOhJ5Z_U
Rate of Turn Indicator (ROTI) (Part 8): https://youtu.be/e5zSJbkA9GY
Top-heavy gyro compass (Part 9): https://youtu.be/wELSqs9ffjg
Bottom-heavy gyro compass (Part 10): https://youtu.be/KcTG8d6CFgg

Bridge Watchkeeping:
Contents of a GMDSS radio logbook: https://youtu.be/-l1K_ZYgy6k
Pilot card, wheelhouse poster and Manoeuvring booklet: https://www.youtube.com/watch?v=RAcXmXs-HEo
Avoidance of false distress alerts: https://youtu.be/PTsUs0in-38
Ship reporting systems: https://youtu.be/I-_QCAXRpjE
Ship routeing system: https://youtu.be/5bOqqf0q0Y0
Master-pilot information exchange: https://youtu.be/iOosAnaqLTY
Factors deciding the composition of engine room: https://youtu.be/Au5APrNJ6V0
Factors deciding the composition of a bridge watch: https://youtu.be/tn4qLie_ghk
Contents of a pilot card: https://youtu.be/6IqcFiWeWX4
IMO guidelines for piracy waters: https://youtu.be/wNbn-RiTDC4
Decision support system: https://youtu.be/gyzfVR2W65Y
Use of ground tackle for beached vessel: https://youtu.be/Y14EVfdI9pg
Heaving to: https://youtu.be/kKtyVCpoIBk
Accidents using watertight doors: https://youtu.be/tJWBYQwoeOs
Master-Pilot relationship: https://youtu.be/LJ43ghzaEPY
Gross tonnage and Net tonnage: https://youtu.be/MuyU_Z6PNBs
Elements of an effective master-pilot relationship: https://youtu.be/Nwad2UUgPw4
Contents of master-pilot information exchange form: https://youtu.be/NAUmc368Gjg

Chartwork:
How to use notices to mariners (Part 1): https://youtu.be/TnKTl0D__yA
How to use notices to mariners (Part 2): https://youtu.be/ucIUr4Iehp8
How to use Notices to Mariners (Part 3): https://youtu.be/a7gvHMOTghk
Using traverse tables: https://www.youtube.com/watch?v=u6xXCv9G0ug&list=PLjZi6sSb2w5bPRRU1h-uno-vGhQrnMbPa&index=36
Mercator chart and sailings: https://www.youtube.com/watch?v=La8KG4jrhPQ&list=PLjZi6sSb2w5bgOQ9xEL99Z8LBCyKBoNXt&index=22
Great circle sailing and gnomonic charts: https://www.youtube.com/watch?v=aMjf5Bqt5Pg&list=PLjZi6sSb2w5bgOQ9xEL99Z8LBCyKBoNXt&index=23
Passage plan with reference to tidal effects and current: https://www.youtube.com/watch?v=4G-dQ6D1eeU&list=PLjZi6sSb2w5bgOQ9xEL99Z8LBCyKBoNXt&index=30
Raster and vector charts: https://www.youtube.com/watch?v=M58jtrIgsGU&list=PLjZi6sSb2w5bPRRU1h-uno-vGhQrnMbPa&index=39
Information on paper charts: https://www.youtube.com/watch?v=L4L6wihfaIc&t=27s
DR and fix position, effects of wind and current, set and drift: https://www.youtube.com/watch?v=y22P1YOntjk&t=7s
Running Fix (Transferring position lines): https://www.youtube.com/watch?v=4sWeF0DFRKk&t=618s
Tidal diamonds: https://youtu.be/8lYz3cyMvSg
Finding the course to steer to counteract tidal currents: https://youtu.be/5DQyUv34zQw
Basic terms, terminology, and symbols: https://youtu.be/ugvNDyM0IUg
Allowing for the effect of wind and current on ship’s course and speed: https://youtu.be/A8T4i4nLIzA
Counteracting for the effect of current and leeway to determine the course to steer: https://youtu.be/fSd8xJ1LXI8