PLANEPLOTTER GPS POSITION WINDOWS

There is no quick fix for a bad chart, but try to switch to another chart if using single mode chart display. If there is a problem with a chart, the chart info box that becomes visible when holding the cursor over the chart rectangle in the chart bar, will say вЂќ Warning: Chart georef accuracy is poor.вЂќДЄ visual warning is that Own Ship turns from Red to Yellow when receiving a gps signal.ДЇirst is a real scale vector version and then. OpenCPN is checking loaded charts for accuracy as far as possible. The GPS status, including available satellites, is also available as an instrument on the DashBoard. The small dialog, containing the GPS indicator and the Course Up / North Up indicator, can be toggled on/off with the вЂњ Ctrl+iвЂќ shortcut. What they will show in the GSV NMEA sentence - all sats in sight or just the ones used varies from manufacturer to manufacturer.

Some modern designs of GPS chip sets disregard вЂњlow qualityвЂќ sats and rely on few ones with optimal reception. Five sats with a strong signal can give a better fix than ten at low elevation pinned on the horizon. In real life, various gps receivers may behave slightly differently, especially when starting up and finding satellites. If your network or multiplex filters the GSV sentences out, the only indicator showing will be the Green Ball. The GSV Sentence contains this information. The GPS may also send data about the satellite constellations (its name/the PRN, azimuth and elevation for each of the sats). The Ball may be using position data with more than 4 satellites available, but not showing any bars because the sentence is filtered out by your network or multiplex filters. That is the minimum and one more satellite is better because it is likely to be more stable. We know a good GPS fix requires a minimum of 4 satellites to resolve the four unknowns X,Y,Z (spatial) and t (time). There is a good fix, the ball just means we get the position often enough. Only if satellite count is available from GPS receiver.ДЄ Ball could be 1,2 or 3 bars, the number of satellites is unknown because the GSV sentence may be unavailable. Only if satellite count is available from GPS receiver.ДЄctive/Valid GPS data + GPS reporting 10+ satellites. Only if satellite count is available from GPS receiver.ДЄctive/Valid GPS data + GPS reporting 5 - 9 satellites. ДЄctive/Valid GPS data + GPS reporting 1 - 4 satellites. Signal is frequent enough and good for navigation, satellite count is not available in the data feed. GPS fix, the position is known and received from the GPS. No GPS data at all, or position not available.

The GPS Status Icons should be interpreted as follows:

PLANEPLOTTER GPS POSITION WINDOWS

This windows visibility is user settable in Optionsв†’User Interfaceв†’ Show Compass/GPS Status Window. The GPS status is then found bottom left. The GPS status is also indicated all the way to the right along the top of the screen, together with the North Up/ Course Up Indicator, unless this position is covered by the floating ToolBar. The default Ownship icon is rendered as grey if there is no valid gps position fix available and like this when a gps fix is available

Planeplotter gps position