Black Diamond Cosmo Head Lamp

The Black Diamond Cosmo head lamp is perfect for sailors with a memory saved variable light dimmer and a red light night vision mode. Lots of utility at an affordable cost.

On The Go Micro Tool Kit

Here is a pocket tool kit that can handle many sailboat needs. This kit will pair well with a multi tool such as a Leatherman. A perfect combo for dealing with hose clamps, zip ties, wire, screws, bolts, nuts, shackles, Phillips, flatheads, torx and Allens.

Regulating a Mechanical Wrist Chronometer Movement

https://calibercorner.com/seiko-caliber-nh35a/

The attached YouTube link explains the regulation of a mechanical watch movement very well. The movement shown in the video is a NH 35A made by Seiko and has the potential to be accurate enough for celestial navigation when a daily rate correction is applied. https://www.youtube.com/watch?v=vz_1rhl1lvY&list=LL&index=6&t=124s

Correction Table For Nautical Almanac Exactly Four Years Out Of Date.

The above table will correct the daily page star SHA Dec list on a Nautical Almanac exactly four years out of date to the current year. The Sun data can be used as is uncorrected.

Ex-Meridian Short Table

This Ex-Meridian short table can be used with a pocket trig calculator or slide rule to obtain an accurate latitude. Add the correction to a bodies altitude that is near meridianal passage (MP) and then solve for latitude as if observed exactly on the meridian. +XM' = minutes of arc to add to observation Ho. t = meridian angle L = latitude d = declination Ho = corrected observed altitude

Weather Proof Custom References and Trig Tables

An alternative to lamination for weatherproofing useful tables and references is to use three ring sheet protectors with a 1/2 inch binder. Pages are very easy to handle.

Wallet Trig Log Scale for Navigation Calculations

A photo copy of a slide rule trig log scale will make for a very nice sextant box and wallet navigation calculator using a pair of chart dividers. The principle is the same as using a slide rule and good enough for most navigation calculations. Give a try for time,speed, distance, plotting sheet scaling, azimuth, amplitude, prime vertical. Even more advanced calculations of ex-meridian and circle of position radius can be done to sufficient precision.

Use this virtual slide rule link to select prefered slide rule to screen capture for printing. https://www.sliderules.org/