Distance calibration by event points

1. An electronic device for tracking a distance traveled by a user along a course, the electronic device comprising:

a location determining element configured to receive location signals from a satellite-based positioning system and to determine a current geolocation of the user;

a memory element configured to store geolocations for a start point and a plurality of event points positioned on the course and known distances from the start point to the event points; and

a processing element in communication with the location determining element and the memory element, the processing element configured to determine a measured distance based on the current geolocation of the user determined by the location determining element and a calibrated distance using the geolocations of the event points;

a display, wherein the processing element determines a remaining distance of the course using the calibrated distance and a pace required to reach the end point based on a time goal, and the required pace is presented on the display;

wherein the processing element determines the calibrated distance to be a sum of the known distance of a most recently passed event point from the start point and the measured distance from the most recently passed event point to the current geolocation determined by the location determining element.

2. The electronic device of claim 1 , wherein the calibrated distance is presented on the display.

3. The electronic device of claim 1 , wherein the processing element determines that the calibrated distance is equal to the corresponding stored known distance from the start point to each event point as the user passes each event point.

4. The electronic device of claim 3 , wherein the processing element determines the user has passed an event point when the current geolocation is approximately equal to the geolocation of the event point.

5. The electronic device of claim 1 , wherein the event points are mile markers along the course.

6. The electronic device of claim 1 , further comprising a wireless receiving element configured to receive at least a first transmitter signal indicating the start point and a second transmitter signal indicating the end point.

7. The electronic device of claim 1 , wherein the event points include a plurality of intermediate event points and an end point.

8. The electronic device of claim 7 , wherein the processing element automatically starts determining the calibrated distance when the user passes the start point and automatically stops determining the calibrated distance when the user passes the end point.

9. The electronic device of claim 1 , wherein the processing element determines a remaining distance of the course using the calibrated distance.

10. An electronic device for tracking distance traveled by a user along a course, the electronic device comprising:

a display;

a location determining element configured to receive location signals from a satellite-based positioning system and to determine a current geolocation of the user;

a memory element configured to store geolocations for a start point, an end point, and a plurality of intermediate event points that are passed by the user as he travels along the course, each event point positioned at a known distance from a stored geolocation; and

a processing element in communication with the location determining element and the memory element, the processing element configured to determine—

a measured distance based on the current geolocation of the user,

a calibrated distance using the known distances of the event points, wherein the calibrated distance is equal to a sum of the known distance of a most recently passed event point and the measured distance from the most recently passed event point to the current geolocation,

a current pace of the user traveling the course as a function of the calibrated distance, and

a remaining distance of the course using the calibrated distance and the pace required to reach the end point based on the time goal;

wherein the display is configured to present the calibrated distance, the current pace and a pace required to reach the end point based on a time goal.

11. The electronic device of claim 10 , wherein the memory element stores the known distance from the start point to each intermediate event point and end point.

12. The electronic device of claim 10 , further comprising a wireless receiving element configured to receive at least a first transmitter signal indicating the start point and a second transmitter signal indicating the end point.

13. The electronic device of claim 10 , wherein the processing element automatically starts determining the calibrated distance when the user passes the start point and automatically stops determining the calibrated distance when the user passes the end point.

14. The electronic device of claim 10 , wherein the stored geolocation is at least one of the start point or another event point.

15. The electronic device of claim 10 , wherein the event points are mile markers along the course.

16. The electronic device of claim 10 , wherein the processing element determines that the calibrated distance is equal to the corresponding stored known distance from the start point to each event point as the user passes each event point.

17. An electronic device for tracking distance traveled by a user along a course, the electronic device comprising:

a display configured to display information that is updated as the user travels along the course;

a location determining element configured to receive location signals from a satellite-based positioning system and to determine a current geolocation of the user;

a memory element configured to store geolocations for a start point, an end point, and a plurality of intermediate event points that are passed by the user as he travels along the course, each event point positioned at a known distance from the start point; and

a processing element in communication with the location determining element and the memory element, the processing element configured to determine—

a measured distance based on the current geolocation of the user,

a calibrated distance that is equal to the sum of the known distance of a most recently passed event point and the measured distance from the most recently passed event point to the current geolocation,

a current pace of the user traveling the course as a function of the calibrated distance,

a remaining distance of the course using the calibrated distance, and

a pace required to reach the end point based on a time goal;

wherein the required pace is presented on the display.

18. The electronic device of claim 17 , wherein the memory element stores the known distance from the start point to each intermediate event point and end point.

19. The electronic device of claim 17 , wherein the processing element automatically starts determining the calibrated distance when the user passes the start point and automatically stops determining the calibrated distance when the user passes the end point.