Month: July 2019

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Radar Reflector

Radar Reflector work by reflecting radar energy directly back to the radar antenna so that your boat appears to be a larger target. So now let’s talk about how and what determines its size –
The RCS (Radar Cross Section) of a given reflector goes up by the fourth power of the radius, resulting in this dramatic increase in the effectiveness of the reflector.

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Nautical Almanac

It contains astronomical data to help in the navigation of the ship. It is published by the hydrographic office of various government or semi-governmental agency. In India, it is Published in Dehra Dun.

Information in NA

Altitude correction table to convert sextant altitude to true altitude.


Altitude correction table

Then there is a calendar of the year with information on eclipses that will occur during that year and location on the earth where they are visible.

Calendar in Nautical Almanac, Here we have a 2008 calendar

Content on the daily page of Nautical Almanac.

Each page contains information of three consecutive days.

Right Page

  1. GHA and Declination of the sun and the moon for every hour of GMT.
  2. Gives information to calculate the time of sunrise, sunset and meridian passage of the sun.
  3. It also provides information to calculate the time of moonrise, Moonset, and passage of the moon.
Right size page of Nautical Almanac .

Left page

  1. GHA Aries for every hour of GMT.
  2. GHA and Declination of 4 planets that are helpful in navigation. (Venus, Mars,Jupiter, Saturn).
  3. SHA and Declination of 57 stars once for all 3 days.
The left side of Nautical Almanac
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