The download files below are presented for your enjoyment only. The MMA take no responsibility for their content and before using any of these  files, for whatever purpose you should satisfy yourself as to their accuracy and suitability .

Tides Calculator
This useful program was highly praised in an article in March 1999 Yachting Monthly. Hans Pieper, the author asks that if you find the program useful you make a small donation to the charity of your choice (RNLI?) and send him a picture postcard! Download Tides Calculator now.

Propellor Size Calculator - New version
This is a really nice spreadsheet originally submitted by John Eastell for calculating the optimum size of propellor based on your vessel and engine characteristics.
Link to Surfbaud site for latest version

DOS Navigation program
Submitted by Philip Stevens. This very old but very useful DOS navigation program was written in 1984 by a computer literate 2nd Mate (I do know his name) - (he later became a senior person in a maritime satellite communications company) - for use on containerships trading world wide and before the advent of Windows. Used carefully it will do all you want in constructing course cards in True North degrees and includes a course-card construction program (in degrees True), a tide program, and a sunrise/sunset program. Download nav-prog.zip See readme.txt within the zipfile for instructions