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YoNav Software Documentation:
Features | Quick Start | Installing | Connecting External Devices | Start YoNav Server | Configure Devices
Troubleshooting | Create a New Survey | YoNav Data Formats
From either the Program menu (if you have installed YoNav on your Start menu) or from the YoNav folder, choose Navcore. (This is the name for the YoNav Server.)
When you start the Client, the YoNav Server is also started.
If this is the first time you have used YoNav Client, a blank Cruise Information screen appears.
A blank map with no data on it appears: this is an UTM projected map.
As soon as you have finished the process of creating a survey, it is a good idea to save it.
YoNav will automatically add a grc extension to the name. "Grc" means "graphics client" file.
Before you begin to use the YoNav software, notice several useful features of the software.
The YoNav Client screen has a Toolbar and three status bars: Survey Line Status Bar, Nav Status Bar, and Status Bar. These status bars contain very useful information and can be turned on or off using the View menu.
In addition, the Survey Line and the Nav Status bars can be detached and re-attached.
Note these additional features of the YoNav Client:
The YoNav Client screen can be resized, made into an icon, or closed, just like a normal NT window. The most useful commands are both in the menus and have a graphic representation on the Toolbar.
From the View menu, choose Survey Line Status Bar. This status bar displays the following data:
(CRO) CRO is the mnemonic that identifies the current cross track error. Cross Track Error is the perpendicular distance measured from the survey line to the vessel. A positive value indicates that the vessel is to the right of the survey line. Negative indicates the vessel is to the left of the line.
(END) END is the mnemonic that indicates the distance remaining between the vessel’s current position and the end of the survey line measured parallel to the survey line
(ALO) ALO is the mnemonic that indicates the distance traveled from the start of line to the vessel’s current position measured parallel to the survey line
(CTS) CTS is the mnemonic for the course to steer value. Course to steer is the course the helmsman would need to steer the vessel in order to maintain a zero cross track error. This item is currently not implemented in the YoNav software.
This menu option is a toggle; click to display the Survey Line Status Bar and then click again to hide it.
From the View menu, choose Nav Status Bar. This menu option is a toggle; click to display the Nav Status Bar and then click again to hide it. This status bar displays the following data:
Current date and time.
The YoNav Server will synchronize the PC clock to the GPS receiver time whenever it detects that two differ by more than 1 second.Current longitude and latitude of vessel.
You can change the units of the displayed position using the preferences dialog(CMG)
CMG is the mnemonic that indicates the course made good or course over ground. This is the actual direction that the vessel has traveled over the ground as opposed to how it is pointing or how it may have traveled through the water.Speed of vessel (SPD)
SPD is the speed of the vessel in knots. 1 knot is 1852 meters/hour.Heading (HDG)
HDG is the instantaneous direction that the vessel is pointing. It differs from the CMG value in that sometimes the direction the vessel is pointing is not the direction it is traveling. Wind and currents can force the helmsman to steer a slightly different heading than the desired course.Depth (DEP)
DEP is the depth of water in meters under the keel of the vessel.The dialogue box allows you to Zoom In or Out a specific distance. For example, click on the down arrow and choose 10000 from the menu that appears. The map is now zoomed out to 10000 meters.
The Nav Status Bar has a dialogue box that allows you to set the view width in preset increments.
- If it is not visible, from the View menu, choose Nav Status Bar.
- Click on the down arrow in the small box to the right of the bar. Choose 10000 from the menu that appears. The map windows is now zoomed out to be 10000 meters wide.
Note: You can change the default units of measurement. From the Edit menu, choose Preferences. Click on Distance Units you want to use.
From the View menu, choose Status Bar. This status bar displays the following data:
The both the longitude and latitude position of the mouse on the map.
This menu option is a toggle; click to display the Status Bar and then click again to hide it.
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From the View menu, choose ToolBar. The Toolbar provides graphic choices for important menu options; you can begin to draw a new route, for example, by choosing the Draw Route command from the Edit menu or clicking on the Draw Route icon in the Toolbar. This menu option is a toggle; click to display the Toolbar and then click again to hide it. See further information on: |
Configuring the seismic shot control feature
A special build of the YoNav server supports an add-in counter timer card to trigger external seismic firing systems based on either time or distance travelled downline. If you require these services be sure to ask ahead of time since there are currently only 2 hardware setups that support this and they are often deployed.
The timing of the shot control engine is approximately 1us when shooting on time.
The accuracy of the distance firing engine is dependent on the quality of the positioning source. The kalman filter is leveraged to continuously predict and update the shot time based on the current position speed and course of the vessel.
In noisy environments, when distance firing is being used, YoNav provides manual lock-out and lock-in stops. For example, a lock-out value of 1000 ms would prevent the system from issuing successive triggers that were less than 1 second apart regardles of what the distance firing enmgine predicts. Similarly, the Lock-In value would guarantee that a shot would be taken at least every N milliseconds regardless of what the distance firing engine predicts.
The YoNav map client can draw and label each point as it is fired providing a good quality control tool for the distribution of shots taken along a line. This feature can be toggled off with the Draw & Label Each Shot Point checkbox. The Clear Shot History button is used to clear the history of seismic shot events in order to make the display more readable.
As each shot is generated the counter timer hardware generates a TTL pulse which drives a Marfac built distribution box that can provide either a contact closure or a TTL pulse to the external seismic hardware. The current counter timer card used is the National Instruments PC-TIO-10. The event engine currently uses the NIDAQ DLL and kernel mode driver under NT to communicate with the TIO-10. Contact Larry Kooker or Mike Boyle for more information of the design of the distribution interface box.
To add a pre-defined map to YoNav, from the Edit menu, choose Map Layers and then Add.
YoNav comes with two pre-defined maps of the San Francisco Bay Area:
Ca-bathy.gob and Ca-coast.gob. (The "gob" extension stands for "graphics object format".)
YoNav Client can import custom maps that you generate using ESRI’s ArcView product to generate "shapefiles". Be sure to generate the shapefile in the UTM zone you intend to survey. Although YoNav Client will not display the attribute data, the full topology of your shapefiles should be viewable.
By default, YoNav tries to keep the ship visible on your screen.
You can turn off this feature to pan further away. Normally, if you want to pan to Japan, for example, YoNav will allow you to do so only by keeping your ship on the screen. If you are in California and want to pan to Japan, YoNav will zoom way, way out.
Use the Mouse to zoom in larger (and less precise) increments:
The mouse can be used to zoom in and set center on an area you are interested in.
Note: Zooming into an area that would exclude the view of the vessel will only be possible when the "Keep Ship Centered" option is disabled .
How to Set Center
The Set Center command allows you to specify the center the map.
You can use this command to center the screen to pan to wherever on your map you want.
Note: This feature allows your to easily lose your vessel on the map. To find the vessel again, return to the Preferences dialog and turn "Keep Ship Centered" option back on.
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U.S. Department of the Interior U.S. Geological Survey Western Coastal & Marine Geology
URL: http://walrus.wr.usgs.gov/marfac/MapClient.html
for more information, contact John Gann
maintained by Laura Zink Torresan
Last updated 7 November 2006 (lzt)
