SIGMA ONYX PRO - Manual (Page 61)

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2.4 MEASURING THE HEARTBEAT
Before starting to train you have to synchronise
the chest belt with the watch once.
Select any training and press the Navigation
button k ENTER.
The synchronisation starts automatically and
takes just a few seconds.
Note: If you do not see this indication on your
watch synchronisation has already been
completed successfully.
After successful synchronisation your ONYX
PRO gives a short confirmation with “Sync ok”.
After your ONYX PRO has successfully synchro-
nised with your chest belt you can start training
by pressing k START.
Note: please refer to Chapter 7.6 “Trouble-
shooting” for possible problems with synchro-
nisation.