Questions and answers

The most commonly asked question: Will this program run on my computer?
Yes, with Windows on your PC, Linux or Mac OS X and Java, see FAQ - Computer.


Mac - OS X notes

In most cases, the required options are set correctly. Nevertheless, check the options before installation: "App Download", "Enable JavaScript" and "Download Java 6" as described below.

New Mac Version OS X Catalina 10.15.1. Problem with Java 6!

>>>>>>>>>>> We'll send you a Mac service module for Java 6.

Java 6 can not be installed
TS running with Service-Modul

Tactical Sailing was tested and runs on Catalina, but you need a 'Service-Modul'. With Mojave, Sierra, etc. installation runs perfectly. First try the following 3 steps on your Mac.

In some cases an error message occurs: "Java 6 can not be installed! A newer version is already installed!"
Write an e-mail to:, give us your error message, if possible with a screenshot. Which Java version is installed with your Mac so far?

We will send a Mac 'Service-Modul' for java 6.

The bug is reported to Apple, but we do not have an answer yet. We have worked out a "Service Modul" for so long. Java 6 will then be installed manually. Write us an email to: and we will gladly help you.


1. Check "Allow apps downloaded from": App Store AND identified Developer

Set download to: "App Store AND identified developers"

Open an option for the Tactical Sailing installation once in "System Preferences / Security / General". Allow apps downloaded from - "App Store AND Identified Developer". This option does not damage your computer. The Tactical Sailing program is a certified program, a "3rd Party Mac Developer Application" and tested. Do not hesitate to get in contact if you have any question, please send an e-mail to:

2. Enable "JavaScript" in Safari browser and download "Java 6"

Check and enable the option "JavaScript" in your browser "Preferences/Security". Try to download to see if your preference is set properly here: Java 6 Version. If the Lion's head is not displayed, set the option "Enable JavaScript". Re-Start Safari and download Java 6.

Empty page, Lion's Head not displayed, Web content: JavaScript NOT enabled!
Web content: JavaScript "enabled"!
Safari browser "Preferences/Security": JavaScript NOT enabled
Safari browser "Preferences/Security": JavaScript enabled

3. Download Java 6
If prompted during TS-installation by Apple, click: "More Info..."
and NOT "OK"!
Then start download Java 6.

Click: More Info ...! NOT OK.
Click: Download

Tactical Sailing runs on Mac OS X

Tactical Sailing runs on OS X 10.11 El Capitan
Tactical Sailing runs on OS X 10.12 Sierra
Tactical Sailing runs on OS X 10.13 High Sierra
Tactical Sailing runs on OS X 10.14.6 Mojave
Tactical Sailing runs on OS X 10.15 Catalina
Apple Mac Notarized for Tactical Sailing

Special cases - Error message

Java 6 can NOT be installed

New Mac Version OS X Catalina 10.15 and Java 6

In some cases an error message occurs: "Java 6 can not be installed! A newer version is already installed!"
Write an e-mail to:, give us your error message, if possible with a screenshot. Which Java version is installed on your Mac so far?

>>> Download the Mac 'Service-Modul' for java 6.

App can't be opened


The message: "" can't be opened because it was not downloaded from the Mac App Store. We are "verified software developer" at Apple. Set an option: "Allow app download = App Store AND Verified Developer" as described in "1st Security".

Apple Identified Developer

As of 19.01.2017 there is a new version of the Tactcal Sailing software (1.170.119  or higher). The installation would be simplified. We are identified software developer by Apple and the software of Tactcal Sailing is signed. There is for Tactical Sailing a free update available, see here.

Notes - Mac OS X Update

Click: "More Info..."

If Apple did update/upgrade your Mac to OS X 10.x, then allow Tactical Sailing to run again. The information appears: To open "" you need to install "Java SE 6 runtime". See our notes to download Java 6 again in 2nd Java 6 download.

Java 6 Runtime - Download Error - no "Lion's head"

The "Lion" face is not displayed.
Set option "Web content: JavaScrpt"

Java Script: If you try to download on Apple website and the "Lion's head" is not displayed and the text: "Download" is not visible, then the option: Web content: "Enable JavaScript" is NOT enabled in your browser e.g. Safari. Enable (!) this option for downloading Java 6 in the "Safari Settings: Preferences/Sequrity" to ON! Reload the website and download Java 6.

There are Java 6 Runtime Download packages available:
Following downloads install the legacy Java 6 runtime:
- Java für OS X 2017-001 for OS X Sierra, High Sierra, Mojave,
- Java für OS X 2015-001 for OS X El Capitan and the older OS Xs, see table. Click the download package which is suitable for your OS X.

Error messages

If you get an an error message that you can not resolve yourself, we are happy to help and find the reason for the error. Send an e-mail to: Please write following information to us:
- which of the Mac OS X mentioned below is installed on your computer,
- which Java 6 Runtime (2015 or 2017) was loaded,
- send a screenshot of the error message.
Your Mac OS X installed for running Tactical Sailing is either:
--- 2019 ------------------------
OS X 10.15 Catalina,
OS X 10.14.6 Mojave,
--- 2018 ------------------------
OS X 10.14 Mojave,
--- 2017 ------------------------
OS X 10.13 High Sierra,
OS X 10.12 Sierra,
--- 2016 or earlier------------
OS X 10.11 El Capitan,
OS X 10.10 Yosemite,
OS X 10.9 Mavericks,
OS X 10.8 Mountain Lion,
OS X 10.7 Lion,
OS X 10.6 Snow Leopard.