Global Positioning System (GPS) Accuracy Indicator

PC21376-UN-17JUL15

Normal

GreenStar™ 2 Display, GreenStar™ 3 Display, and Generation 4 CommandCenter™ alert operator when current StarFire™ signal is not optimal for high accuracy operations. There are three levels of this alarm system (Normal, Marginal, and Poor). Levels are determined both by StarFire™ Receiver position dilution of precision (PDOP) value and the number of satellites being tracked.

Use care when StarFire™ Receiver is being used in high accuracy operations as accuracy degradation may occur.

NOTE: When operating in real time kinematic (RTK) or RTK Extend™ (RTK-X), both PDOP and number of satellites are used to determine level of alarm.

When operating at a signal level less than RTK (SF3, SF1, or WAAS), only PDOP is used to determine level of alarm.

GPS accuracy indicator must be completely green for in-season repeatability with SF3.

Normal

• Green bar
• Normal operating range
• Acceptable range for high accuracy operations
• PDOP value: 0—3.5
• Six or more satellites in solution

PC21377-UN-17JUL15

Marginal

Marginal

• Orange bar with permanent operator alert sign
• Marginal operating range
• Moderate risk of accuracy degradation
• PDOP value: 3.5—4.5
• Five satellites in solution

PC21378-UN-17JUL15

Poor

Poor

• Red bar and flashing operator alert sign
• Poor operating range
• Significant risk of accuracy degradation–high accuracy operations are not advised
• PDOP value greater than 4.6
• Four satellites or less in solution