Citizen D700 Instruction Manual download pdf (Page 19)

The following provides an explanation of the diving terms displayed by this watch along

with their basic meanings.

This watch employs the calculation formula of the Canadian Defense and Civil Institute of

Environmental Medicine (DCIEM).

This watch automatically distinguishes between skin diving and scuba diving according to

the following conditions, and records log data separately for each type of diving.

• Scuba diving: Continuously diving for 3 minutes or more to a depth of 1 m or more

• Skin diving: Continuously diving for less than 3 minutes to a depth of 1 m or more

In this watch, one dive constitutes the time from initially diving to a depth of 1 m (start of

dive) from the preliminary dive mode state to the time the dive mode is terminated (end of

dive).

<No-Decompression Diving and No-Decompression Limit (NDL) Time>

No-decompression diving refers to diving that allows the diver to ascend to the surface

without stopping for decompression during the course of ascending following completion

of a dive. The limit time during which this no-decompression diving is allowed is referred

to as the no-decompression limit time. No-decompression limit time varies according to

the diving depth and diving time of the previous dives.

Safety stop refers to a temporary stop made during ascending for safety reasons in order

to promote expulsion of nitrogen in the body, and is performed even if the no-

decompression limit time has not been exceeded. In the case of having dove to a depth of

18 m or more, a safety stop should always be made at 5 m of depth to ensure safety.

This refers to diving beyond the no-decompression limit time. Decompression diving is

extremely dangerous since nitrogen accumulates in the body beyond allowable levels.

Never dive in this manner.

This refers to a stop that must be made to ensure the necessary decompression in the

case of having performed decompression diving. It is necessary to make a

decompression stop at a predetermined depth (decompression stop instructed depth) and

predetermined time (decompression stop instructed time) when ascending.

This refers to the minimum time required to ascend to the surface from the current depth in

the case of ascending at the rate of 18 m/min or less while making a decompression stop in

accordance with the decompression stop instructions during decompression diving.

Decompression Diving Warning

This alarm sounds for 3 seconds and the decompression stop

indicator (STOP) is displayed on the display when the no-

decompression limit time has been exceeded resulting in

decompression diving during the course of diving.

The display returns to the no-decompression diving display when

decompression stop is performed in accordance the decompression

stop instructions.

Exceed Maximum Depth Warning

When the limit depth of 40 m for recreational diving is surpassed

during the course of diving, an exceed maximum depth error

occurs, the current depth flashes and the alarm sounds for 15

seconds. During diving at a depth greater than 40 m, the warning

alarm sounds for 15 seconds every minute.

This warning function is canceled when the depth returns to 40 m or

less.

Permanent Error Warning

The instructed depth flashes and an alarm sounds continuously

when either of conditions 1 or 2 below are met. If hazardous diving

or ascending is continued while ignoring this warning, a permanent

error (ERROR) occurs:

1. When not ascending to the instructed depth and continuing to

dive at an excessively low depth (diving at which the instructed

decompression stop depth exceeds 9 m.) even though having

been instructed to make a decompression stop (Permanent Error

Warning 1).

The warning stops when the diver begins to ascend immediately and the

decompression stop instructed depth reaches 9 m or less.

2. When having ascended to a depth 1 m or more less than the instructed depth after

having been instructed to make a decompression stop (Permanent Error Warning 2).

In this case, the warning is canceled when the diver returns to the instructed depth.

If hazardous diving or ascending is continued even after the

permanent error warning function has been activated, a permanent

error results, "ERROR" appears on the display and the entire

display flashes.

When a permanent error has occurred, the next dive cannot be

made for 24 hours. (The water depth measurement function does

not operate for 24 hours. In addition, "ERROR" is displayed when

the watch is switched to the dive plan mode, and the no-

decompression limit time is not displayed.)

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Citizen D700 Instruction Manual Page 19

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