本帖最後由 nothize 於 2013-6-23 18:36 編輯 |
1. How to get GPS position fix?
Cardio implements a GPS status bar to indicate current GPS signal strength. This page is automatically displayed after entering meter view, and exit after position-fix is done.
The best way to allow GPS gets your position is to wear the watch on your wrist, with the watch surface facing up. GPS antenna is located near the Enter key, please don’t let the antenna facing down or cover it with hand.
Meaning of the status bar is explained below.:
■ No GPS / Weak
These two status indicates GPS signal does not present or is very weak. Under this environment it is very difficult to get position fix. This status usually happens when you’re in urban area, close to buildings. Please move to open area.
■ Fair / Good
In these two cases GPS should be able to acquire position in several minutes. When “Fair” is displayed, we recommend to move to areas until “Good” is displayed to acquire as many satellites as possible.
After position fix, this status is displayed and then enters Meter view automatically.
The status bar will be blinking before position-fix is acquired. Press any key at this page will force the device to enter meter mode. You can still check GPS status at meter view by inspecting the icon located at up-right corner (as shown in the figures below), or by pressing Down key to switch back to GPS status bar. Do not start logging before GPS position fix. Information such as track, distance and speed cannot be properly acquired without it.
Cardio adopts preloaded satellite information to accelerate position-fix. Upon connection of Cardio to PC with the following two criterions: 1. BrytonBridge installed, 2. Internet connection available, latest satellite information is automatically loaded to Cardio. This information not only accelerates position-fix, but also enhances the position accuracy. It is highly recommended to connect Cardio with the PC you used for activity upload one or two days before your training or race.
2. How to choose proper GPS operation mode?
Three GPS operation modes is available in the following menu:
This FAQ gives advices about how to choose proper GPS mode, based on your exercise time and environment.
Choose this mode to turn GPS off.
Please use this mode for indoor activities, when you want to record data from sensors such as heart rate, speed/cadence sensor, or using the stride rate feature in Running mode.
Saving battery is not the only reason for choosing off mode. For example, imagine you’re running on treadmill near the window. If GPS is not turned off, given enough time GPS may get position fixed, which will result in false tracks and distance calculation.
■ Full Power:
Full Power mode trades battery life in favor of GPS accuracy.
Full Power mode is recommended for the following conditions:
A. When used in environment with limited sky view, such as urban area or forest.
B. When used in small, repeated path, such as track fields.
C. When saving battery is not a concern for you. Typical battery life for Cardio40 is 8hrs in PowerSaving and 5:30hrs in Full Power. For Cardio60 it’s 16hrs and 11hrs respectively. If your exercise time is much lower than the specified battery hour, choose Full Power to maximize GPS accuracy. GPS accuracy affects parameters such as distance and speed. When using Full Power in Cardio40 for a Marathon race, make sure the device is fully charged before the event.
PowerSaving saves battery life with reduced GPS position accuracy.
When exercising in environment with good sky view, such as in country side or along the river. With good sky view, there will be no major accuracy difference between PowerSaving and Full Power. In these cases, choose PowerSaving to maximize battery life.
3. Tips for improving GPS accuracy
A. Allow time for Cardio to collect satellite before starting your exercise.
GPS requires some time to download satellite information, as number of available satellite increases, position accuracy is enhanced accordingly. GPS’s signal receiving ability is best in static rather than moving. So our recommendation is to turn your Cardio into Meter view, and put it beside you for ~10 minutes while doing stretching exercise.
B. Download satellite information from BrytonBridge before use.
Upon connecting Cardio to a PC with: a. BytonBridge installed, b. internet connection, the latest satellite information is automatically downloaded to Cardio. This pre-loaded information accelerates GPS time-to-fix and satellite collection. It is highly recommended to connect Cardio with the PC you used for activity upload one or two days before the training or race.
(The pre-loaded information is effective for two weeks, newer information results in more significant enhancement.)
C. Use Full Power mode for better GPS accuracy. This option is available in: Settings\General\GPS. See FAQ “How to choose proper GPS operation mode?” for further information.
4. Stride rate incorrect?
Cardio adopts accelerometer to count and calculate stride rate. Since the accelerometer is located on wrist, its accuracy may be affected if your hand’s motion is not synchronized with your steps. Specific movements of the hand, such as drinking water or wiping sweat may also affect stride accuracy temporarily.
5. How to Reset Cardio?
In case the system hangs up and do not respond to any operations, a forced system reset may be needed. Press and hold Light, OK and Down buttons simultaneously for 3 seconds to force a reset.
6. Incorrect tracks at outdoor swimming?
Because GPS signal cannot be received under water, swimming styles can affect whether GPS gets proper position fix or not. For example, free style should result in proper track log, because the wrist constantly leaves the water and allow GPS to receive signal. On the other hand, breast stroke which keeps the hand in water may result in incorrect track.
7. Heart rate belt does not work for swimming?
Cardio adopts ANT+ heart rate monitor, which with its high operating frequency does not work under water. This is common to all ANT+ sensors.
For triathlon, it is recommended to wear HR belt after swimming. Because water will reduce the strength of heart beat signal, if the belt is wore before swimming, heart rate may not be properly captured after leaving the water for a period of time.