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General| Type | Sextant |
|---|---|
| Telescope | 3.5 x 40 mm |
| Manufacturer | Davis Instruments |
| Model | Mark 3 |
| Micrometer Drum Readability | 0.1 minutes of arc |
| Vernier Readability | 0.2' |
| Index error correction | Adjustable |
| Horizon error correction | Adjustable |
Aligns the index mirror perpendicular to the frame for accurate zero readings.
Corrects index mirror perpendicularity to prevent vertical line jump.
Adjusts index mirror parallel to horizon mirror when sextant reads zero.
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