Trip Odometer vs Track Distance
Some commonly asked questions regarding the Garmin GPSr Trip Computer
- "Why is the Trip Computer odometer distance greater than my Track Log distance?"
"Why is the Trip Computer odometer distance less than my Track Log distance?"
"Which is correct?"
While these questions are easy to understand, the answers will require some explanation regarding Garmin GPSr recording functions.
- A Track Log consists of a series of track points (or bread crumbs) recorded by your GPSr.
Garmin GPSr allow the user to adjust how and when track points are recorded:
- Distance (records new track points at a specified distance, regardless of time elapsed)
Time (records new track points at a specified frequency, regardless of distance traveled)
Auto (records new track points as needed, determined by direction of travel and velocity)
- Time (user selected time interval between recorded track points)
Distance (user selected distance interval between recorded track points)
- The Trip Computer records the total distance traveled and displays the information in the Trip Odometer data field.
The Trip Odometer distance will increase only when the GPSr position changes.
The Trip Odometer is updated at a fixed frequency of 1Hz, or once every second.
The Trip Odometer can be reset to zero at any time.
- Longer Track Log recordings will exhibit greater accumulated discrepancy than shorter Track Log recordings.
For clarity, only a very short section of track log is displayed in this example.
Every Track Log has a Start Point (A) and End point (B):
The GPSr will travel from Point (A) to Point (B):
The actual path traveled between Point (A) and Point (B) requires navigating some obstacles:
The Track Log records Track Points at the user specified interval:
The Track Log distance traveled is calculated between Track Points:
The Trip Computer records Track Points at an interval of one per second (1Hz):
The Trip Computer distance traveled is calculated between Track Points:
The Trip Computer distance is greater than the Track Log distance:
- Track Log distance vs Trip Computer odometer will vary based on Track Record settings for each GPSr device.
More Track Points generally translate into improved accuracy.
To achieve a Track Log distance that closely resembles the Trip Computer odometer at Point (B):