Oceanic Watch / Dive Computer GEO - Manual (Page 137)

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If for any reason, the GEO shuts Off then turns On again for
any reason during any Dive, the message ERR (Error) will be
displayed with the Up Arrow and current Depth (Fig. 124).
If this occurs, it is highly recommended that you terminate the
dive and begin a safe ascent to the surface.
Upon surfacing, and any time thereafter, when access to Dive
Computer Operating Mode is attempted from Watch Mode,
only the message ERR will be displayed (Fig. 125).
No Dive Computer Modes/screens will be inaccessible.
If this occurs, the GEO must be returned to the factory for
evaluation/service prior to any further use for diving activities.
ERROR (RESET DURING A DIVE)
Fig. 124 -ERROR
WHILE DIVING
Fig. 125 -SURFACE
AFTER ERROR
DURING A DIVE