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Here's the full text on HO 230 from Bowditch Vol. I (1984, p. 611).

[BEGIN QUOTE]

H.O. Pub. No. 230 (Goetz), High Latitude Celestial Navigation Tables,
designed in 1945 by Roy F. Goetz, was published by the U. S. Navy
Hydrographic Office in 1946.

The first section, called "Star Tables," is entered with the latitude to
the nearest 1° from 70°N to 89°N, the name of the star (for ten selected
stars), and LHA Aries at intervals of 2° for latitude 70° to 79°, 5° for
80° to 84°, and 10° for 85° to 89°. Altitude is tabulated to the nearest
1' and azimuth (not azimuth angle) to the nearest 0°.1. A "∆H" value is
given for use with an auxiliary table to interpolate for precession of
the equinoxes (art. 1419).

In the second section, called "Declination tables," declination is
substituted for the name of the star. A separate table is given for each
1° declination from 0° to 28°. For each degree a "same name" section is
given first, followed by a "contrary name" section (to declination 19°).
The minimum altitude is 1°. The declination tables give "d" in place of
"∆H" for use with an auxiliary table to interpolate for declination..

Only 400 of these tables were published. They were intended only for use
in military aircraft operating beyond the latitude range of H.O. Pub.
No. 218. Aftr Pub. No. 249 became available, H.O. Pub. No. 230 was canceled..

[END QUOTE]

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