Hello matey, this calculator will help you determine the ship’s gyro compass error fast and easy.
Yes, no need for Tables A, B and C! (You know what I mean.)
Here’s how to use it.
- Sight the celestial body and record the Gyro Compass bearing (GB).
- You also need to record the following right after the sight was taken: (1) UTC Time, (2) current GPS position, (3) the ship’s gyro and compass headings and (4) Variation.
- In the Star Finder sheet, update the cells UTC, Body (if known only), Latitude and Longitude only. No need to update the ‘Date’ unless otherwise your computer’s calendar is wrongly set.
- Click ‘Click to advance 5 minutes’. The celestial bodies re-align on the chart.
- If you don’t know the name of the celestial body yet, most probably a star, refer to the horizontal vales of the chart. For example, when your GB is 090◦T, check what star lies straight above 090 in the chart, and you’ll know its name.
- Mouse-over in the celestial body sighted, and you’ll get its True Bearing (TB).
- Voila! you can now solve the ship’s Gyro Compass error. It’s the difference between the celestial body’s GB & TB. If GB>TB, affix West. If not, affix East.
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