GPS Accuracy Indicator

GREENSTAR softkey >> GUIDANCE softkey

The GS2/GS3 alerts the operator when the current StarFire signal is not optimal for high accuracy operations. There are three levels of this alarm system (Normal, Marginal, and Poor). The levels are determined both by the StarFire receiver's PDOP value and the number of satellites being tracked.

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

NOTE: When operating in RTK or RTK-X, both PDOP and “Number of Satellites” are used to determine the level of alarm.

When operating at a signal level less than RTK (SF2, SF1, WAAS, etc.), only PDOP is used to determine the level of alarm.

PC9387-UN-17OCT06

Normal

Normal

• Green Bar
• Normal Operating Range
• Acceptable range for high accuracy operations
• PDOP value: 0 - 3.5
• 6 or more satellites in solution

PC9388-UN-17OCT07

Marginal

Marginal

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

PC10384-UN-17OCT07

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
• 4 satellites or less in solution