Sherwood Wisdom 4 setup guide
Also covers: Sherwood Wisdom 4, Wisdom 4 DC, Wisdom IV
Air-integrated console computer (hose to the first stage) with two buttons: Advance on the front and Select on the side. Air, Nitrox (21–50%) and Gauge modes; shows tank pressure and Air Time Remaining. Nitrox O2 % goes to 50% after a dive unless the default is turned off. User-replaceable CR2450 battery.
Buttons
| Button | Where | What it does |
|---|---|---|
| Advance | front of the console | Switch on; next screen; accept a setting; in a dive: backlight and silence an alarm |
| Select | side of the console | Change the flashing value (hold to scroll); in a dive: alternate screens |
Turn on / wake
Press the front Advance button briefly to switch it on. It shows all segments, counts down, checks itself, then shows the TIME screen.
PressAdvance
Manual p. 13It also switches on by itself when wet, if Wet Activation is ON. Once on, it goes to dive mode when you descend to 1.5 m (5 ft).
Manual p. 13Press Advance to step through the surface screens: DATA, PLAN, LAST, LOG, HISTORY, SIMULATOR, SET.
PressAdvance
Manual p. 14To light the screen on the surface, press both buttons together briefly. To go back to TIME, hold both buttons for 2 seconds.
Press togetherAdvancePress togetherSelect
Manual p. 15There is no off button. After 10 minutes without use it sleeps; it switches off after 2 hours (stays asleep 24 hours after a dive).
Manual p. 13
Date and time
From TIME, press Advance 7 times to reach SET GO TO. Press Select 4 times to show SET 4, then press Advance.
PressAdvancePressSelect
Manual p. 20Hour format: press Select to choose 12 or 24, then press Advance.
PressSelectPressAdvance
Manual p. 28Hour: hold Select to scroll to the right hour, then press Advance. Do the same for the minutes.
HoldSelectPressAdvance
Manual p. 29Year, then month, then day: hold Select to scroll each value and press Advance to accept it.
HoldSelectPressAdvance
Manual p. 29After the day, it returns to SET GO TO. Hold both buttons for 2 seconds to go back to TIME.
Hold togetherAdvanceHold togetherSelect
Manual p. 30
Units (m/ft, °C/°F)
From TIME, press Advance 7 times to reach SET GO TO. Press Select 3 times to show SET 3, then press Advance.
PressAdvancePressSelect
Manual p. 26Wet Activation (H2O SENSOR) shows first. Press Advance to keep it and go to Units.
PressAdvance
Manual p. 27Press Select to switch between FT, F, PSI and M, C, BAR. Press Advance to accept.
PressSelectPressAdvance
Manual p. 27Set units before other values: depth, temperature and pressure units all change together.
Manual p. 27
Water type (salt/fresh)
Not available on this computer
There is no salt/fresh water setting (setting groups, p. 20). Above 915 m (3,000 ft) it switches to fresh-water depth measurement by itself (p. 45).
Dive mode (Air / Nitrox / Gauge)
From TIME, press Advance 7 times to reach SET GO TO. Press Select once to show SET 1, then press Advance.
PressAdvancePressSelect
Manual p. 20The mode flashes. Press Select to choose AIR, NITROX or GAUGE, then press Advance to accept.
PressSelectPressAdvance
Manual p. 20Warning: after a dive in NITROX or GAUGE, that mode is locked for 24 hours after the last dive. Do not choose GAUGE unless your instructor says so.
Manual p. 21When 24 hours have passed and it has switched off, it starts again in AIR mode.
Manual p. 21
Nitrox O₂% and ppO₂ limit
FO2 starts at 21% each time it is switched on again and set to Nitrox. With DFT ON it shows 50% ten minutes after a dive until you set it again (pp. 21–22).
Set the mode to NITROX in SET 1 (see Dive mode) and press Advance. The PO2 alarm screen appears.
PressAdvance
Manual p. 20PO2 alarm: hold Select to scroll from 1.20 to 1.60 (factory 1.60), for example to 1.40. Press Advance to accept.
HoldSelectPressAdvance
Manual p. 21FO2: press Select to change the O2 % by 1% (21–50%), or hold to scroll. The max depth for your PO2 is shown. Press Advance.
PressSelectHoldSelectPressAdvance
Manual p. 21DFT (FO2 default): press Select for ON or OFF, then Advance. ON sets O2 to 50% ten minutes after each dive.
PressSelectPressAdvance
Manual p. 22Before every nitrox dive, check the O2 % on the DATA screen matches your tank.
Manual p. 14
Conservatism / personal setting
Not available on this computer
The manual describes no conservatism or personal setting; the setting groups are modes/basics, alarms, utilities and time only (p. 20).
Altitude
Altitude is detected automatically; there is no manual altitude setting (p. 45).
Nothing to set: it measures air pressure when switched on and every 15 minutes, and adjusts for altitudes from 915 m (3,000 ft) to 4,270 m (14,000 ft).
Manual p. 45The DATA screen (press Advance once from TIME) shows the altitude level: SEA, LEV2 to LEV7, or outr if too high.
PressAdvance
Manual p. 14
Audible alarms (depth / time)
There is no dive-time alarm setting; the Reserve Time alarm (1–30 min, factory 5) warns when dive time remaining runs low (p. 25).
From TIME, press Advance 7 times to reach SET GO TO. Press Select twice to show SET 2, then press Advance.
PressAdvancePressSelect
Manual p. 22ALL alarms: press Select for ON or OFF, then Advance. OFF turns off all settable alarms, so keep it ON.
PressSelectPressAdvance
Manual p. 22Ascent alarm (ASNT): press Select for ON or OFF, then Advance.
PressSelectPressAdvance
Manual p. 23Depth alarm (DEEP): choose ON, press Advance, then hold Select to set 9–99 m (30–330 ft). Press Advance.
PressSelectHoldSelectPressAdvance
Manual p. 23Turn and End pressure, Reserve time, Deco and PO2 alarms follow. Use Select to change and Advance to accept each.
PressSelectPressAdvance
Manual p. 24In a dive, press Advance to silence a beeping alarm. The red light on the lower left flashes with it.
PressAdvance
Manual p. 10
Reading the log after a dive
From TIME, press Advance 4 times (DATA, PLAN, LAST, LOG) to reach LOG GO TO. Within 10 minutes after a dive, press it once.
PressAdvance
Manual p. 16Quick look: the LAST screen (3 presses) shows start and end time, max depth, dive time and end tank pressure.
PressAdvance
Manual p. 16At LOG GO TO, press Select to open the newest dive (date, number, mode, O2 %). Press Select again for older dives.
PressSelect
Manual p. 17Press Advance for Screen 1 (max depth, dive time, end pressure, lowest temperature) and again for Screen 2 (times, max PO2, altitude).
PressAdvance
Manual p. 17The log keeps the last 50 dives.
Manual p. 16
Battery
A battery icon on the TIME screen means 75% of the power is used. Change the battery before the next dive.
Manual p. 11If the icon flashes for 5 seconds when you switch on and it turns off, the battery is too low. Do not dive.
Manual p. 11It uses one 3 V CR2450 lithium battery. The cover on the back opens with a coin.
Manual p. 42Settings and dive data are kept during a quick battery change.
Manual p. 42
What the main screen shows
The TIME screen shows time of day, date, surface time, mode (AIR, NITROX or GAUGE) and tank pressure.
Manual p. 13In a dive: max depth, dive time, current depth, tank pressure and SAFE MINUTES (dive time remaining).
Manual p. 33SAFE MINUTES is the shortest of no-deco time, air time remaining (to your End Pressure) and oxygen time.
Manual p. 32Bar graphs show nitrogen loading, oxygen loading (nitrox) and ascent rate. Do not ascend faster than 9 m (30 ft) per minute.
Manual p. 9Press Select in a dive for temperature and time, and (nitrox) PO2 and O2 %. Press Advance for the backlight.
PressSelectPressAdvance
Manual p. 33
Pre-dive check
Tick each item before you get in the water.