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YoNav is a real-time navigation and data acquisition program written in Microsoft C/C++ that provides navigation services on almost any DOS platform. The YoNav Graphical User Interface (GUI) supports virtually any VGA and most EGA graphics hardware. In its fullest configuration, YoNav will support up to 10 simultaneous serial RS232 channels, 4 channels of digital I/O, ttve video display and frame capture from 3 types of video input and graphic support for over 150 different printers. The same software will also operate on a notebook PC with only one or two serial inputs. YoNav is completely configurable by a small utility YoCfg that allows various pieces of optional hardware to be configured in or out of the system. Data can be logged in either or both a compact binary or standard USGS ascii format on any system disk. Post-plotting of binary format navigation data can occur while data is still being acquired through a multi-tasking time slice process. introduction During the winter of 1991, the USGS Marine Facility began development of a portable PC based integrated navigation system that would replace the aging navigation RhoRho ^system currently in use. One of the driving factors for a new navigation system was the completion of the GLORIA Exclusive Economic Zone (EEZ) work and the termination of the lease of the R/V Famella which had been the primary research vessel for marine operations since the late 1980's. The RhoRho system had been designed mainly to provide steering displays and navigation services to the GLORIA project on a ship that always had the same sensors, helmsmen and navigators. With the acquisition of a new vessel on the horizon, it became apparent that we needed a navigation system that could be portable, work with many different navigation sensors and have a modem graphical user interface that is both intuitive and easily learned by less experienced watchstanders. This paper describes and documents the operation and setup of this system known as YoNav. 2Gann, John T . 1988, Integrated GPS, Range-range and Hypeibolic Loran C Marine Navigation System for Use on IBM AT or Compatible Microcomputers, USGS Open File Report 88-562, 39 pages File Edit Utilities Display Config IYoNav V1.68 37 38.54393' N 122 12.75851' W (Scale 531 ) Figure 1. Anatomy of Main Navigation Display 255 15:54:22.686 37 36.45326' N 122 12.62669* W Trimbie NavTrakll

YoNav; your own integrated navigation system for DOS platforms