NavList:

Dear all that have a passion for astronavigation,

I have written my master dissertation on false horizons at the AMA Belgium - celestaire PBH and davis artificial horizon - and I would like to know how many of you astronavigators have used or bought an instrument like this to train before you go out at sea on merchant vessels, pleasure yachts, uscoastguard, etc or even the professional version that is being made by C&P?

The goal of my dissertation was to show my academy that it is indeed possible with a false horizon to teach future officers to train with a sextant in practice and determine ones position when there is no horizon available in the form of the natural seahorizon. I had good results and was able to pinpoint the location of where I was standing to within <1'  with the use of a celestaire PBH. Unfortunately there were some setbacks:

PBH was not 100% compatible with my C&P sextant

The davis artificial horizon was not suited to be used for culmination of the sun

...

Who of you has already bought these items or does anyone know how much are being sold worldwide to estimate how many people train with these before they go out to sea

This is :

Practice bubble horizon -PBH- from celestaire

Artificial horizon from Davis

professional bubble horizons from C&P

Are there companies out there that are working on improving these instruments being these companies or others because I see a lot of patents when searching with google patents , but most of them are from inventors from the United States Navy.

Like finding a way to eliminate the bubble correction with the pro bubble and PBH?

combining a bubble with a nightscope or whatever?

The big reason to ask this is because I am passionate about the topic and I want to help stop sending officers onboard that just read the gps coordinates without knowing the background of how GPS works.

Let me know something and good star hunting!

Best regards,

MSc Jan Jaap Maes