The NMEA Sage GPS Goto Control

	*GPS Goto Control* Updated November 28, 2006
	Download GPSGoto.ocx Visual Studio Control The Goto Control conforms to the NMEA $..RMB sentence [Recommended Minimum Navigation Information] via the RMB Method. One must also use the Property cHeading to tell the control the current heading (denoted as "Track" on the control), or use the HDT Method via the NMEA sentence $..HDT [Heading True]. The indicator shows the desired direction to the waypoint; the compass card's top shows the heading (track) the boat is currently on. In this example, the boat is heading South-east (133 degrees), and the waypoint is at 120 degrees: we are off course. At the bottom of the control shows the Cross Track error (XTE). If the Cross Track Error line is on the right side of the center line, one must steer left to get back on course. The maximum value for XTE is 9.9; the center line is the decimal point for the XTE number (in this example, 1.4 is the XTE number).
	You may use several Properties to change the color of the indicator, the style of the indicator (line or dot), the font color, and the compass's back color. The control includes the Arrived Event that is triggered when the RMB sentence notes that one's location is at, or very close to, the waypoint. Note that the speed indicated is not the speed of the boat through the water; nor is it the speed of the boat over the ground--- it is the speed of the boat toward the waypoint. If the track (boat's heading) does not equal the waypoint's direction (bearing), the speed to the waypoint will be less than the boat's speed: if the heading and the bearing are both the same, only then will the speed indicate the boat's speed.
Events: Arrived Resize GotoError Methods: HDT RMB BlankControl Properties: Heading BorderStyle Speed Bearing XTE Waypoint Distance Night Twilight BackColor FontColor ErrorNumber ErrorDescription ScaleTicks IndicatorColor IndicatorStyle Error Codes 0 - No Current Error 1 - RMB NMEA sentence appears malformed. It must start with $ 2 - RMB NMEA sentence is not a valid $..RMB sentence. 3 - RMB Sentence $..RMB appears malformed. 4 - Indicator style must be 0 (needle) or 1 (dot). 5 - Tick scaling must be from 1% to 1,000% 6 - HDT NMEA sentence appears malformed. Must start with $--HDT. 7 - BorderStyle must be 0 or 1. 8 - Heading must be from 0 to 360. 9 - Bearing must be from 0 to 360. 10 - Speed must be 0 or greater. 11 - Waypoint name must be no more than 6 characters. 12 - Distance must be 0 or more. 13 - XTE must be from -9.9 to 9.9
NMEA Sage Home Page The Banded Compass Control The Compass Control The North Biased Compass Control The Goto Control Course and Speed (Ground) The Position Control Engine RPM Control The Rudder Control The GPS Satellite Health Control The GPS Satellite Elevation Control Set and Drift control The NMEA Talker Control Depth and Water Temperature Control The Wind Control The Cross Track Alarm Control The Pilot Control Waypoint Plotter Control Radar Control Goto Simple Control