Dive Computer advice please

[rhwestfall]

I do not think tec computer was available in 1998 or was very expensive.

Cochran Commander (air and nitrox versions)..... I got one in the early 90's when I started going to recreational limits wreck diving the Great Lakes.

Price couldn't have been too bad then as I was just out of school with my first real job....

One of the first computers advertised to never lock you out.

 

[scubadada]

I do not think tec computer was available in 1998 or was very expensive.
My best SAC is 6L per min on single or around 8L on twin with 2 stage bottles.
Did I mention that I used table for rec dive or is it your own assumption based on what? I used the same basic dive computer for rec dive since 1996.

6 liters/min is a phenomenally low gas consumption rate for a whole dive, 0.21 cu ft/min

 

[lexvil]

Something that will work and cost so little

Mares Quad Air Wrist Dive Computer

Mares Quad Air Scuba Computer has a magnificently clear display with jumbo size information, hoseless tank data integration for up to three transmitters with three-row layout comprises all relevant da

dolphinscuba.com

 

[Centrals]

6 liters/min is a phenomenally low gas consumption rate for a whole dive, 0.21 cu ft/min

In tropical warm water, not against current and physically fit.
I have came across many experienced dive guides in SE Asia with ridiculous SAC.
It is only relative when it comes to SAC and nothing to write home about.

 

[34109411]

Guys time for the silly question so do you leave the transmitter on the first stage at all time or you take it out after your diving is done ? ( just wondering )

 

[Wants2divemore]

I leave it on all the time.

 

[Centrals]

Guys time for the silly question so do you leave the transmitter on the first stage at all time or you take it out after your diving is done ? ( just wondering )

If I removed a hose from the 1st stage, I will replace the O ring on next installation.

 

[Bloody Marvelous]

​

SHEARWATER​	Peregrine	Tern	Tern TX	Perdix 2	Teric	Petrel 3
Depth rating​	120m / 394ft	120m / 394ft	120m / 394ft	260m / 850ft	200m / 660ft	290m / 950ft
Buttons​	2 (316 steel)	4 (316 steel)	4 (316 steel)	2 (Titanium Piezo)	4 (316 steel)	2 (Titanium Piezo)
Color screen​	Y	Y	Y	Y	Y	Y
Screen​	LCD	AMOLED	AMOLED	LCD	AMOLED	AMOLED
Screen size​	55.9mm / 2.20"	33.0mm / 1.30" ø	33.0mm / 1.30" ø	55.9mm / 2.20"	35.3mm / 1.39" ø	66.0mm / 2.60"
Crystal​	Toughened Glass	Toughened Glass	Toughened Glass	Toughened Glass	Sapphire	Toughened Glass
Resolution​	320x240px	360px ø	360px ø	320x240px	400px ø	320x240px
AI​	-	-	Y	Y	Y	Y
Transmitters​	-	-	Up to 4	Up to 4	Up to 4	Up to 4
Vibration alerts​	Y	Y	Y	Y	Y	Y
Watch style​	-	Y	Y	-	Y	-
OC TEC mode​	-	-	-	Y	Y	Y
CC/BO mode​	-	-	-	Y	Y	Y
Freedive mode​	-	Y	Y	-	Y	-
Log hours @ 10s​	200	500	500	1000	500	1000
Battery​	Internal Li-ion	Internal Li-ion	Internal Li-ion	1.5V Lithium AA¹	Internal Li-ion	1.5V Lithium AA¹
Battery life²​	30 hours	20 hours	20 hours	60 hours	30 hours	60 hours
Gas mixes​	3 OC	3 OC	3 OC	5 OC/CC	5 OC/CC	5 OC/CC
Compass​	-	-	Y	Y	Y	Y
Price USD³​	$550	$650	$775	$1165	$1170	$1400
Price CAD⁴​	$700	$850	$1025	$1470	$1500	$1650
Price EUR⁵​	€499	€699	€829	€1069	€1139	€1440
Price GBP⁶​	£500	£615	£740	£1060	£1085	£1200

¹ Will accept any AA battery, but vibration mode is only supported on Lithium and rechargeable Li-ion batteries.
² On medium brightness, AI turned off, and with listed battery type. Rechargeable batteries may lose capacity over time.
³ USD prices taken from Scuba.com
⁴ CAD prices taken from Shearwater.com
⁵ EUR prices taken from Duikwereld.nl
⁶ GBP prices taken from MikesDiveStore.com

 

[LI-er]

do you leave the transmitter on the first stage at all time or you take it out after your diving is done ? ( just wondering )

Not understanding why you would even consider removing the transmitter after each dive? Do you remove the SPG and hose or the 2nd stage regulators?

Every time you remove a fitting the O-ring has to reseat and you're increasing the chances of leaks.

And gaining nothing.

 

[Bloody Marvelous]

Guys time for the silly question so do you leave the transmitter on the first stage at all time or you take it out after your diving is done ? ( just wondering )

You leave it on, but you close the cylinder valve and purge the regulator.
The transmitter will automatically turn on when it detects pressure, so leaving your regulator pressurized will drain your transmitter battery.