GPS Scoring ProceduresGPS Scoring Procedures

The ConceptThe Concept

• Remove judges from ground checkpoints

• Improved scoring accuracy and reduction in number of timing errors

• Allows for tracking and judging of more parameters in the future

Garmin GPS Map 76sGarmin GPS Map 76s

• Two units installed in each aircraft– One designated primary, one secondary

• Position is recorded every second– Approximately 10 foot accuracy

• Scoring data is captured every two seconds– Allows for up to three hours of data– Maximum error is 1 second per leg

GPS Scoring Kit InstallationGPS Scoring Kit Installation

• Two GPS units will be sealed in a camcorder bag secured in the cargo compartment

• External antennas will be mounted– In rear window of C152/C172 aircraft– In side windows of baggage area of PA28

aircraft, one on each side– Suction cups and tape will hold antennas in

place

Starting TimeStarting Time

• A gate has been established for each runway– 17/35 is the

preferential runway

Taxiway ECHO is the gate for either 17 or 35. Aircraft MUST be airborne prior to crossing the gate, full length departure is required.

For 18 or 36, the gate is the departure end of the runway.

Runway 4/22 is the gate for either 12 or 30. Aircraft MUST be airborne prior to crossing the gate.

For 4 or 22 the gate is the departure end of the runway.

Arrival Over Turn PointArrival Over Turn Point

• Arrival time is determined in one of two ways:– Crossing the plane– Point of closest approach (PCA)

• Missed turn point– Scoring program will still take time, but will

assess a penalty for missing the checkpoint

Crossing The PlaneCrossing The Plane

Time is taken as the aircraft crosses the plane

Gate established perpendicular to the inbound course

Point of Closest Approach (PCA)Point of Closest Approach (PCA)

3/4 NM radius Turn Point Circle

Time is taken at closest data plot to the turn point within the 3/4 NM Turn Point Circle

Crossing The Plane & PCACrossing The Plane & PCA

Since you are inside the Turn Point Circle, you will be scored on crossing the plane, not PCA.

Missed CheckpointMissed Checkpoint

Since you are outside the Turn Point Circle, you will be scored on PCA, not breaking the plane, and a missed checkpoint penalty will be assessed.

Any Questions?Any Questions?