Manual Sherwood Courier CR100 (page 5 of 11) (English)

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16 COURIER

WNER’S M

ANUAL

■■Enter Another Mode—You can either take the steps

outlined shortly to enter Dive Plan, Date/Time Set or

Sleep Modes, or simply take your Courier under water,

thus activating Dive Mode.

2.5 Using Your Courier at Altitude

Among the Courier’s many features is the fact it adjusts

automatically for diving at altitudes of up to 7,872

ft/2,400 m. To show that it has made this adjustment,

the Courier displays its altitude settings in the form of

mountain symbols with the numbers 1 and 2 on them.

This is what the symbols mean:

Symbol Altitude Range

(None) Sea Level to 2,624 ft/800m

One Mountain Shows 2,624 ft/800m to 5,249 ft/1,600 m

Two Mountains Show 5,249 ft/1,600 m to 7,882 ft/2,400 m

(Both Mountains Flash) Above 7,872 ft/2,400 m (Out of Range)

Prior to using your Courier at altitudes substantially above

sea level, you should find out what the actual altitude of

your dive site is, and make certain that the altitude set-

tings your Courier displays accurately matches this height.

Do not use your Courier to dive at altitude

unless the altitude settings accurately match

the actual height above sea level. Doing so

could cause the Courier to display inaccurate

information. You should also not use your

Courier to dive at altitude when both altitude

setting symbols appear and flash on and off.

This means that you are above an altitude of

7,872 ft/2,400 m, which is beyond the

Courier’s ability to function accurately.

COURIER OWNER’S MANUAL 17

It is also important your Courier not be in Dive Mode

when making sudden, substantial changes in altitude—

such as when flying in an airplane. This would most likely

result from storing your Courier with wet dive gear,

which might touch its external electrical contacts and

fools the Courier into thinking it is under water. It can

interfere with your Courier’s ability to function accurately.

Do not pack or store your Courier with wet

dive equipment. Doing so may cause it to

erroneously enter Dive Mode and interfere

with its ability to accurately process and display

data.

Your Courier monitors and adjusts for changes in altitude

in all modes except Dive and Date/Time Set Mode. It will

display its current altitude settings in all modes except

Log and Sleep Modes (in Log Mode it displays the alti-

tude settings applicable to a particular dive).

Upon arriving at altitude, your Courier’s Residual

Nitrogen Bar Graph may show that there is excess nitro-

gen present, even though you may not have made any

dives in the preceding 24 hours. It may also display a sur-

face interval value, which later re-sets itself.

If you have obtained the Altitude Specialty Diver train-

ing which everyone should have before diving at alti-

tudes substantially above sea level, you already under-

stand that this should be expected. By ascending to a

higher altitude from a lower one, your body will have

more nitrogen saturated in body tissues than would be

present had you spent the preceding 24 hours at the

higher altitude. By displaying residual nitrogen and a sur-

face interval, your Courier is merely reflecting this fact.

18 COURIER OWNER’S MANUAL

2.6 Dive Plan Mode

Your Courier’s Dive Plan Mode enables you to answer the

question, “If I enter the water right now, how long will

the Courier allow me to stay at various depths while

remaining within the No-Decompression Limits?” Among

the benefits of activating your Courier before taking it

under water is that it enables you to “scroll” through Dive

Plan Mode to help better estimate and plan your dive.

Figure 5: Dive Plan Mode.

To enter this mode: From Surface Mode, simply press

the A button once and release it.

What you will see: When you first enter Dive Plan

Mode, your Courier will display a depth of either 30 feet

or 9 metres, and the allowable No-Decompression Limit

(NDL), in minutes, that it projects for this depth. If you do

nothing else, within four seconds, your Courier will

“scroll,” displaying the available No-Decompression Limit

for the next 9.8 ft/3.0m depth increment. This will contin-

ue until the Courier reaches a depth of 157 ft/48m. At

this point, the Courier will again display the No-

Decompression Limit for 30 ft/9m, then continue

“scrolling” through subsequent depths until the cycle

again repeats itself.

min

SURF T.

NDL

Depth

Residual Nitrogen

(appears whenever

computer calculates

residual nitrogen

is present)

Available

No-Decompression

Limit (NDL)

Surface Interval

(appears whenever

computer calculates

residual nitrogen

is present)

COURIER OWNER’S MANUAL 19

■■You can accelerate the scrolling process by repeatedly

pressing and releasing the A button. Doing so will

cause the Courier to advance to the next depth incre-

ment each time you press the A button (it is normal for

there to be a slight delay before the available No-

Decompression Limit appears).

Here are the No-Decompression Limits the Courier dis-

plays when it calculates that there is no residual nitrogen

present from previous dives:

Depth (Feet) Depth (Metres) Time (Minutes)

30 9 200

39 12 105

49 15 66

59 18 47

69 21 35

79 24 25

89 27 19

98 30 16

108 33 13

118 36 11

128 39 9

138 42 8

148 45 7

157 48 7

If your Courier calculates that there is residual nitrogen

present from previous dives, the available No-Decompres-

sion Limits it displays will be shorter. The Courier will also

display Surface Interval Time and its Residual Nitrogen Bar

Graph during Dive Plan Mode—just as it does during

Surface Mode.

Warnings you may encounter: Depending on how

much residual nitrogen the Courier calculates is present, it

may not display any available No-Decompression dive

time for some deeper depths. Instead, it will simply show

a series of double hyphens.

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Sherwood Courier CR100 Manual

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