INFO - GPS - PAGE 1

Screen: INFO - GPS - PAGE 1

Press: INFO >> STARFIRE RECEIVER

Press PAGE button to access additional pages.

This screen shows information and status of incoming GPS and differential correction signals. No information on this screen can be changed. It is for viewing only.

This cell shows date and time for Greenwich Mean time.

This cell displays vehicle location latitude coordinates with respect to Equator (north or south).

This cell shows vehicle location longitude coordinates with respect to Prime Meridian (east or west).

This cell shows height of receiver in meters (feet) above sea level.

NOTE: Course and speed normally show small speeds and various courses even when machine is not moving.

This cell displays direction of travel, in degrees, relative to true north (zero degrees) as measured by receiver. Angle is measured in clockwise direction.

This cell shows ground speed of machine in kilometers per hour (mile per hour) as measured by receiver.

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This cell shows status of GPS signal: 2-D (two dimensional with latitude and longitude of vehicle) or 3-D (three dimensional with altitude, latitude, and longitude of vehicle).

Position mode cell also shows status of differential signal: SF 1 (StarFire 1 differential), SF 2 (StarFire 2 differential).

This cell shows age of differential correction signal to GPS (normally less than 10 seconds).

This is the total number of GPS satellites available to your receiver that are above 7 degree elevation mask.

This cell shows number of satellites actively used to compute position.

This cell shows precision of GPS position signal. Precision of signal is affected by geometry of satellites being used.

• PDOP-position dilution of precision
• HDOP-horizontal dilution precision
• VDOP-vertical dilution of precision

Version 7.00 and greater StarFire receiver software includes GPS Accuracy Indicator (GPS AI). GPS AI gives an indication of GPS position accuracy achieved by StarFire receiver, and is displayed as a percentage (0-100%). GPS AI is displayed on RUN Page of Parallel Tracking (Figure 1), AutoTrac, and Field Doc and INFO › GPS › Page 1 screen (Figure 2).

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When receiver is initially powered, GPS AI will display 0%. As receiver acquires satellites and calculates a position, GPS AI will increase as accuracy improves. Acceptable guidance performance for Parallel Tracking and AutoTrac is achieved when GPS AI displays 80% or greater. This may take up to 20 minutes. GPS accuracy is affected by many factors. If 80% accuracy or greater is not achieved within 25 minutes, consider following possibilities:

• Unobstructed view of sky › trees, buildings, or other structures may block receiver from receiving signals from all available satellites
• L1/L2 signal to noise ratio (SNR) › radio interference from 2-way radios or other sources may cause low SNR
• Satellite position in sky › poor GPS satellite geometry can reduce accuracy
• Number of satellites above elevation mask › this is total number of GPS satellites available to your receiver that are above 7 degree elevation mask
• Number of satellites in solution › this is the total number of satellites that are being used by receiver to calculate a position

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