From: Doug Royer
Date: 2005 Aug 5, 10:38 -0700
I've used the following software for many years in during real life nav evolutions. It will be as "accurate" as you need for obtaining reasonable results. It has a perpetual almanac, sight reduction features and LOP position features. It also has other nice features such as distance off or height of objects using sextant angles.
It's easy to use and quick to show a result.
Go to the following website and download a free trial version of the "CelestNav" software. The trial version is the same as the registered version. After the trial date has expired functions are disabled until the software is bought for $50.00.