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• Keep the watch on the same arm as the Speed + Distance
Sensor.
• Check the batteries in the sensors. Low battery voltage will
reduce the radio transmission power.
• Reposition the sensor(s) closer to the watch, if possible.
• Move away from potential sources of interference.
Q: When using the Heart Rate Monitor function, why do I some-
times see a flashing question mark or dash marks next to the
heart rate display?
A: These are indications that the Heart Rate Sensor is having dif-
ficulty calculating your heart rate. This may be due to:
• Poor or loose fit of the Sensor on your chest
• The Sensor being worn upside-down on your chest
• The conductive material on the underside of the Sensor is
not sufficiently moistened
Q: How can I reduce the SEARCHING time?
A: The Speed + Distance Sensor will lock to the GPS satellites
more quickly if you keep motion during this period to a mini-
mum, and stay in an open area. Also, avoid leaving the Sensor
on for long periods of time while indoors.
Q: How often is the GPS data calculated and updated?
A: The Speed + Distance Sensor calculates your velocity and dis-
tance traveled once per second, and transmits this informa-
tion to the watch every 3.5 seconds.
Q: I am already monitoring data from one Timex® sensor and I
want to also view data from a second one that I just turned
on. What do I do?
A: Press and hold the DISPLAY button for about two seconds
(you must be in Time of Day, Chrono or Timer modes). The
watch will beep and the antenna icon will flash, indicating that
the watch is searching for a second Timex® sensor. Within a
few seconds, the antenna icon should stop flashing and the
new data should appear on the watch face (you may have to
press and release DISPLAY to select the new data in Time of
Day or Timer modes).
Q: Occasionally I see “NO DATA FROM HRM” or “NO DATA FROM
GPS;” what do these messages mean?
A: These messages will appear on the watch display when the
watch is not receiving signals from the designated sensor.
Sometimes these messages pop-up when you might expect
them, such as a few seconds after you’ve shut your Speed +
Distance Sensor off, for example. Other times, you might see
them during your workout unexpectedly. In that case, the
most common causes of these messages are severe radio
interference or too much distance between the watch and the
sensor. Most of the time, the watch will correct the problem
itself, with no action on your part. However, if these messages
are becoming a problem, here are a few things to try:
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