Track Mapping Accuracy?
GPS created track maps are created from vehicle position. The characteristics of GPS signals are such
that the vehicle position accuracy is relative to the period of time the vehicle is in motion. For example,
during an on track period of 10-15 minutes, the true vehicle distance could vary a distance of less than
12”. Over a period of hours, the worst case scenario for vehicle location to vary is 9 feet. However, the
Racepak software is capable of providing corrections to the data, in order to bring the accuracy within
acceptable limits. GPS track mapping is capable of producing accurate track maps from courses that
combine highly bank and extremely flat areas (such as the road course at Daytona) without the typical
problems associated with inertia based mapping.
Can I install a larger Compact Flash Card?
Yes, it is OK. A 128MB card can store over 30 hours of GPS data.
How can I email a Runfile or Trackmap?
Runfiles are contained in the following directory:
C\RacepakData\G2X\Year\Track
Track maps are contained in the following directory:
C\RacepakData\GPSMaps
Runfiles and track maps may be emailed the same as any other email attachment, such as photos, Word
documents, etc. It is suggested to first ZIP either, before attaching to the outgoing email. Emailed
Runfiles and track maps should be placed in the same directory, by the recipient.
Should multiple users comparing data from the same track, use different track
maps?
No, if multiple G2X users are at the same track and desire to compare data, it is best for one user to
create the map, and share between all users. This assures the ability to accurately compare segment
times. Remember, your vehicle may not generate the same lateral g forces at the same point on the
track. Therefore your segments would differ, if the same lateral g forces were used to create the
segmented track map.
What is the difference between lap times displayed on the dash, and lap times as set
by the creation of a track map?
In terms of accuracy, nothing. The point to remember is the setting of start / finish using the display
dash is the same as passing a beacon transmitter, on the racetrack. However, when a track map is
created, it is still necessary to located the start / finish area in the Datalink Create GPS Map Runlog
page. The main advantage of setting start / finish with the dash is the ability to instantly receive laptime
data from the display dash, along with viewing laptimes in the Datalink software. In addition, it makes
it possible to graph the Lapmarker channel, in the Datalink software. The Lapmarker channel will
display a vertical mark, each time the vehicle passes the start / finish area, in graphed data.
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