SUUNTO EON STEEL - Manual (Page 41)

NOTE: If you surface and then dive again within five minutes,
Suunto EON Steel counts this as one dive.
3.16 Multi-gas diving
Suunto EON Steel allows gas changes during a dive between the
gases defined in the Gas(es) menu. When ascending, you are always
notified to change gases when a better gas is available.
For example, you may have the following gases when diving to 55
m (180.5 ft):
• tx18/45, MOD 58m
• tx50/10, MOD 21m
• oxygen, MOD 6m
While ascending, you are notified to change gas at 21 m (70 ft) and
6 m (19.7 ft) according to the maximum operating depth (MOD) of
the gas.
A pop-up notifies you when to change gases, as shown below:
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