Edge Simulator Doc 1.0ss8

E DGE D IVE C OMPUTER S IMULATOR Version 1.0ß8 - March 7, 1991 ©1991 by Gertjan J. Noordman “Edge Simulator” is free for personal use only, and cannot be sold Written in MPW C++ 3.1 I N T R OD U CT ION The program Edge™ Dive Computer Simulator is a simulator for the Edge Dive Computer. The program simulates diving with the Edge for both no-decompression and decompression situations. The program uses the same decompression algorithms and shows the same display as the actual Edge dive computer. This text serves the purpose of a manual for the program, but is actually an addition to the owner’s instructions manual for the Edge dive computer. The reason is that familiarity is assumed with the usage of dive computers in general, and possibly with the Edge dive computer in particular. Also, this text is not intended to be a replacement for the Edge owner’s instructions manual. T H E E D GE D IV E C OMP U T E R The Edge (Electronic Dive Guide™) is manufactured by Orca Industries. The Edge Dive Computer, ©1984 by Orca Industries, is a compact submersible computer which provides the diver with information to plan a dive, it is a precision depth control, dive timer and surface interval timer. It handles single dives as well as repetitive dives. The Edge calculates continuously the decompression status based on the diver’s individual dive profile, and gives the diver a continuous readout of this status. -2- Dive Mode Surface Mode Figure 1 Edge display shown when underwater in a no-decompression situation, and at the surface. The simulation program uses the same decompression model as the Edge, i.e. the Haldanian decompression model which is similar to the Navy standard air decompression model. The model is based on the uptake and elimination of nitrogen in twelve tissue groups with half times ranging from 5 to 480 minutes. As for the Edge, the update interval for the decompression status is 3 seconds. T H E S IMU L AT ION W IN D OW The simulation window for the Edge contains all items to control the diving. The window contains the Edge display, a depth control for changing the diver’s depth, a time scale to change the scaling for the actual time, a clock for the elapsed time, and buttons to control the simulation. There is only one menu item for program control, i.e. the Quit item in the File menu to quit the program (same function as the close box in the window). The Edit menu is supported for Desk Accessories, and has no usage for the program itself. Edge Display The main item in the simulation window is the Edge display (figure 1). Following is a short description of the numeric information tha…