INFO tab

PC9705

StarFire iTC - Main-Info Tab


A-Info tab
B-Setup tab
C-Activations tab
D-Serial Port tab


E-Position Mode
F-Differential Mode
G-Latitude
H-Longitude


I-Altitude
J-GPS Course
K-GPS Speed
L-Accuracy


M-GPS Signal
N-Differential Signal
O-Roll Angle
P-Yaw Rate

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

  • Position Mode: Indicates whether receiver is calculating a 3D position, 2D position, or no position (No Nav). It also shows status of differential signal: SF1 (StarFire 1 differential), SF2 (StarFire 2 differential).
  • Differential Mode: Indicates 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).
  • Lat: Displays vehicle location latitude coordinates with respect to Equator (north or south).
  • Lon: Displays vehicle location longitude coordinates with respect to Prime Meridian (east or west).

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NOTE: TOGGLE button allows operator to change the way latitude and longitude are displayed from degrees/minutes/seconds to decimal degrees.

  • Altitude: displays height of receiver, measured from top of dome, in feet (meters) above sea level.
  • GPS course: Displays direction of travel, in degrees relative to true north (zero degrees) as measured by receiver. Angle is measured in clockwise direction.

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

  • GPS speed: displays ground speed of machine in miles per hour (kilometer per hour) as measured by receiver.
  • GPS Accuracy Indicator (GPS AI): GPS AI gives indication of GPS position accuracy achieved by receiver, and is displayed as a percentage (0-100%)

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 the following possibilities:

  • Unobstructed view of sky › trees, buildings, or other structures may block receiver from receiver 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 (check satellite button › Graph)
  • Satellite position in sky › poor GPS satellite geometry can reduce accuracy (check satellite button › SkyPlot)
  • Number of satellites above elevation mask › this is the total number of GPS satellites available to receiver that are above 7 degrees elevation mask (check satellite button › SkyPlot).
  • Number of satellites in solution › this is total number of satellites that are being used by receiver to calculate a position (check satellite button› SkyPlot).
  • GPS Signal Quality: Displays quality of signals being received from constellation of GPS satellites.
  • Differential Signal Quality: Displays quality of differential correction signal being received by receiver.
  • TCM (Terrain Compensation Module):
    • Roll Angle: Is both a graphical and numerical representation of amount of roll TCM is measuring, relative to calibrated zero degree reference. A positive roll angle means vehicle is rolled to right (depicts what horizon would look like from cab).
    • Yaw Rate: This gives a graphic representation and a numeric figure for amount of rotation TCM is measuring. Positive yaw rate means vehicle is turning to right.

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