If you have a hard disk, the easiest way to run the demonstration is to unzip the contents of the downloadonto the hard disk:

1) Make a new directory on the hard disk.
2) Copy or unzip the files into the new directory.
3) Make the new directory the current directory.
4) Enter the command "DEMO".
5) If you will be downloading the GLM demonstration
you will need to execute Organize.exe from within the GLMdemo
directory to setup a GLM desktop shortcut. Access to the GLMdemo
is then through the desktop icon.

Hardware Requirements

The program is designed to run on a Windows PC with a Pentium or equivalent processor and a CD ROM drive.The hard disk should have at least 6 MB of free space.


The complete Users Manual describes all of the features of the GHS system. A copy can be purchased and the cost will be applied as a credit toward your purchase of the software.The GLMdemo manual can be accessed with the "?" in the Edit Loads Screen or via the Help menu.


GHS performs complete hydrostatic and stability calculations including load condition tabulation, derivation of as-inclined conditions, maximum VCG (KG) determination, tank capacity tables, etc. GHS allows more rigorous analyses than other programs in that tank liquids are modeled exactly, effects of water on deck can be examined, stability can be run on waves, and external heeling moments due to wind, snagged trawl nets, tow lines, etc. can be included. Even the spilling of cargo such as would happen with an open hopper can be simulated.

GHS may be run either interactively or through the use of Run Files. Menus are available allowing the novice user to become familiar with the command structure of the program. Once you have developed a familiarity with the commands, you will discover the power of Macro Commands and Run Files to generate large amounts of data with less likelihood of human error.

GHS DEMO uses a Run File and menus to demonstrate just a few of the features of the program. The User's manual thoroughly documents the over 100 commands available and shows how to get started with this exceptionally productive tool.

Using Load Editor (Instructions for GHS Demo only.)

The Load Editor selection is the only part of the demonstration which is not automated. When making this selection, you will enter the GHS module called Load Editor, a spreadsheetöstyle screen for loading tanks, setting fixed weight loads, and evaluating the vessel's stability. You can change or edit loads in tanks and change fixed weight items in order to simulate the vessel's past, present, or future loaded condition. The ESC key will always take you back to theMain Menu.

Load Editor is a module which fills two roles: a) For the naval architect using GHS to explore the stability implications of various loading scenarios, Load Editor acts quickly to set up each loading and instantly evaluates its stability. b) For the Vessel Operator who needs a stability assessment for a current or anticipated loading condition, Load Editor provides it in a simple, direct manner.

This demonstration is an example of a configuration which might be used by the operator of a supply or fishing vessel. Several tanks and a few fixed (solid) weights are included so you can try various loading combinations. The Load Editor screens are divided into four sections:

1) The information box (upper portion of the screen) shows how the vessel is sitting in the water (Drafts, Trim and Heel), how much the vessel weighs (Displacement), where the center of gravity is located (LCG, TCG and VCG), free-surface adjustment (FSA) based on actual free-surface moments (excluding cargo holds if modeled), Maximum VCG, Effective VCG, VCG Margin, and the roll period or GMt.

2) The loading box (upper middle portion of the screen) shows either the tank list or the weight item list. The TAB key can be used to toggle between these two screens. You can move up and down the list by using the UP and DOWN ARROW keys or the PAGE UP and PAGE DOWN keys. You can move back and forth between columns by using the RIGHT and LEFT ARROW keys. A bar-cursor indicates the cell you are currently working in. To make changes the cursor must be in the correct cell or column, locate the cursor in the desired cell, type in the new value, and press ENTER or the appropriate "hot" key from the key menu.

3) The key menu (lower portion of the screen) shows various "hot" keys and their functions.(Note: "Ctr-" indicates a "Control" key combination. For example, "Ctr-Q" means that the "Ctrl" key and the "Q" key are pressed at the same time.) The key menu also has prompts and reminders to tell you what kind of information is expected for the cell where the cursor is located. For example, when the user is viewing the Tank Screen, the key menu will show Tab Solid Weights meaning that pressing the TAB key will switch the middle screen to the fixed weightitem list.

4) If your computer is equipped with EGA or VGA graphics, the lower portion of the screen shows profile and plan views of the vessel. Each view shows all of the modeled tanks. When the cursor is on a particular tank in the loading box, that tank is highlighted in both the plan and profile views making it easy to identify the tank that is being loaded. When working with fixed weights, an "X" shows the location for the center of gravity for the weight item where the cursor is located.

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Notice: The demonstration program is a modified version of the actual GHS program. While it is useful for demonstrating certain features of GHS , it should not be relied upon for accurate results .

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