JACKMAN FUSION EQUIP
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ELECTROFUSION PROCESSOR OPERATORS MANUAL - REV 0
Page 39 of 48
Position Error Indicator
The Position Error Indicator gives the operator an indication of how much confidence the operator should
place in the accuracy of the current position reading:
Value
Rating
Description
1
Ideal
This is the highest possible confidence level to be used for applications demanding the highest
possible precision at all times.
1-2
Excellent
At this confidence level, positional measurements are considered accurate enough to meet all but
the most sensitive applications.
2-5
Good
Represents a level that marks the minimum appropriate for making business decisions. Positional
measurements could be used to make reliable in-route navigation suggestions to the operator.
5-10
Moderate
Positional measurements could be used for calculations, but the fix quality could still be improved.
A more open view of the sky is recommended.
10-20
Fair
Represents a low confidence level. Positional measurements should be discarded or used only to
indicate a very rough estimate of the current location.
>20
Poor
At this level, measurements are inaccurate by as much as 300 meters with a 6 meter accurate
device (50 DOP × 6 meters) and should be discarded.
As a general rule, confidence indications above a value of 2 should not be used although the
SMART Scanner™
will not prohibit the operator from using any reading.
Although it is beyond the scope of discussion for this manual, the number we refer to as the Position Error
Indicator is actually the “Horizontal Dilution of Precision” value (HDOP) rounded to the nearest integer for
those with a more advanced knowledge of GPS terminology.
