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Sherwood Courier CR100 Manual

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12 COURIER
O
WNER’S M
ANUAL
Figure 3: Check Mode.
Warnings you may encounter: There are no specific
warnings that appear during Check Mode; however, you
should examine the display carefully to make certain
all pixels appear clearly.
If all pixels do not appear clearly during Check
Mode, do not take your Courier diving.
Instead, you should return it to an authorized
Sherwood dealer for immediate service. Failure
to do so could result in damage to or loss of
equipment, serious personal injury or
death.
Although it is possible to take your Courier diving without
first activating it on land, we do not recommend this.
Instead, you should “awaken” your Courier first (by press-
ing either the A or B buttons), then observe it in Check
Mode to help ascertain that everything is functioning
properly. If you do not do so, it is theoretically possible
that your Courier could give you erroneous information
SLOW
DECO
min min
min
°F °C
MAX
SURF T.NDL
DIVE TIME NDL
TOTAL
AVE
FT
m
FT
m
12
COURIER OWNER’S MANUAL 13
under water, and you would not be aware that it was
doing so.
To exit this mode: Within two to three seconds of
entering Check Mode, your Courier should automatically
enter either Surface or Dive Mode, depending on
whether you activated the computer by pressing its A or
B buttons, or by taking it under water.
2.4 Surface Mode
Assuming that you follow the recommended procedure
of activating and checking your Courier before taking it
under water, it will remain in Check mode for from two
to three seconds, then enter Surface Mode. Your Courier
will also enter Surface mode immediately upon ascend-
ing from any dive.
Figure 4: Surface Mode.
To enter this mode: There is no specific action you
must take to get your Courier to enter Surface Mode—
other than to press its A or B buttons if it is “asleep.” You
will discover that Surface Mode is the Courier’s default
mode whenever it is “awake” and not under water.
SURF T.
12
Today’s
date
Altitude Setting
Residual Nitrogen
(appears whenever
computer calculates
residual nitrogen
is present)
Current time in
hours:minutes
(24-hour clock)
Surface Interval
(appears whenever
computer calculates
residual nitrogen
is present)
14 COURIER OWNER’S MANUAL
What you will see: If your Courier does not calculate
that there is residual nitrogen present from previous dives,
it will display only the current date and time.
■■Date Format—The format the Courier uses to display
the current date is that common in the USA and Japan,
in which the first set of one or two digits signifies the
month, and the second set of one or two digits (follow-
ing the hyphen) signifies the day. Thus, a date of 11-3
would represent the third of November.
■■Time Format—The Courier uses the 24-hour clock for-
mat, common in aviation and military service, to signify
time of day. Thus, a displayed time of 13:04 would
represent 1:04 PM.
12-Hour 24-Hour 12-Hour 24-Hour
Clock Clock Clock Clock
12:00 AM 00:00 12:00 PM 12:00
1:00 AM 01:00 1:00 PM 13:00
2:00 AM 02:00 2:00 PM 14:00
3:00 AM 03:00 3:00 PM 15:00
4:00 AM 04:00 4:00 PM 16:00
5:00 AM 05:00 5:00 PM 17:00
6:00 AM 06:00 6:00 PM 18:00
7:00 AM 07:00 7:00 PM 19:00
8:00 AM 08:00 8:00 PM 20:00
9:00 AM 09:00 9:00 PM 21:00
10:00 AM 10:00 10:00 PM 23:00
11:00 AM 11:00 11:00 PM 23:00
If your Courier calculates that there is residual nitrogen
present from previous dives, it will also display the Surface
Interval Time (SURF T.) that has elapsed since ascending,
and a symbolic representation of the overall quantity pre-
sent on its Residual Nitrogen Bar Graph.
■■“SURF T.” Format—The format your Courier uses to dis-
play Surface Interval Time (SURF T.) is HOURS:MINUTES.
COURIER OWNER’S MANUAL 15
■■Residual Nitrogen Bar Graph—This is a row of nine
pixels that represents the overall saturation of body tis-
sues with nitrogen. When all nine pixels appear under
water, it means you have reached (or exceeded) the
No-Decompression Limit (NDL). On the surface, fewer
than nine pixels should appear, and the number of pix-
els appearing should diminish over time—as the level of
excess nitrogen present in your system diminishes as
your Surface Interval Time passes.
One of the greatest benefits of this symbolic representa-
tion of nitrogen levels during surface intervals is that it
helps you decide how long to wait before re-entering the
water. For example, should you elect to make a repetitive
dive when there are more than just a few pixels appear-
ing, you will discover that your available no-decompres-
sion dive time ends up being very short. Thus, it makes
sense to wait until fewer pixels appear, and you can en-
joy longer bottom times with a greater margin of safety.
If you are more than 2,624 ft/800m above sea level,
your Courier will also display its current altitude settings.
We will discuss these shortly.
Warnings you may encounter: There are none—other
than the Low Battery Indicator discussed earlier.
To exit this mode: You can exit Surface Mode in a vari-
ety of ways. Among them:
■■Allow Your Courier to go “Back to Sleep”—If you
have awakened your Courier from Sleep Mode and
take no further action within five to six minutes, it will
return to Sleep Mode automatically. If your Courier has
been under water in the past 24 hours, it will also go
“back to sleep” once it calculates that there is no longer
residual nitrogen present.
… 4 …


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