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Search took 0.00 seconds. Search: Posts Made By: goboatingnow
Forum: Navigation 14-10-2022, 02:30
Replies: 93
Views: 11,925
Posted By goboatingnow
Re: Sextant App

Loads of gps coordinates have been mapped to this type of representation. It’s largely superfluous
Forum: Navigation 11-10-2022, 02:23
Replies: 93
Views: 11,925
Posted By goboatingnow
Re: Sextant App

Why. Electricity doesn’t arbitrarily fail , there are 4 GNSS systems up there

You use and learn celestial these days cause it’s a hobby. Nothing else.
Forum: Navigation 11-10-2022, 02:22
Replies: 93
Views: 11,925
Posted By goboatingnow
Re: Sextant App

I’ve used this method which hasn’t been taught formally since about 1920 ( that’s when it disappeared from Bowditch ) the table of corrections are difficult to find these days.

It’s an inaccurate...
Forum: Navigation 10-10-2022, 12:23
Replies: 93
Views: 11,925
Posted By goboatingnow
Sextant App

I had an old Casio programmable calculator that I programmed to do the sight reduction maths. Quite nice. It died and I went back to paper. Be easy enough to build a spreadsheet app or something...
Forum: Navigation 07-10-2022, 13:07
Replies: 93
Views: 11,925
Posted By goboatingnow
Re: Sextant App

I enjoy sextant sights. The iPhone app is handy as it saves carting the sight reduction tables around.

What I never would suggest is it’s a backup to gps. As I’ve said three are 11 GNSS capable...
Forum: Navigation 06-10-2022, 08:22
Replies: 93
Views: 11,925
Posted By goboatingnow
Re: Sextant App

iPhone apps like iMariner will automate all the sight reduction process including embedding all the almanac tables. At least no more carrying HO volumes of sight reduction data.
Forum: Navigation 06-10-2022, 06:34
Replies: 93
Views: 11,925
Posted By goboatingnow
Re: Sextant App

There ate several methods of sextant navigation

Marc Hilare where azimuth fixes are taken from celestial bodies and lines of position ( aka fixes ) are plotted. Lat Lon is then deduced by their...
Forum: Navigation 06-10-2022, 05:49
Replies: 93
Views: 11,925
Posted By goboatingnow
Re: Sextant App

Sounds very precise and those resulting lines of position might give you 100 mile accuracy

Of course the sight reduction tables , not sure where the “ young ones “ will get those

A good...
Forum: Navigation 06-10-2022, 05:46
Replies: 93
Views: 11,925
Posted By goboatingnow
Sextant App

Clearly you have never used a sextant and taken three star fixes , reduced them and plotted lines of position , a sextant gives you fixes from known stars just like a land based fix gives you lat...
Forum: Navigation 05-10-2022, 23:15
Replies: 93
Views: 11,925
Posted By goboatingnow
Sextant App

There are IOS apps that will do the sight reduction calculations for you and you then draw the resulting line of position on the paper chart , there is one app that lets you compute multiple sights...
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