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The Scuba Doctor has a great range of quality dive computer solutions for technical and rebreather divers.

Decompression Algorithms: ZHL-16C, VPM-B, DCAP, DCIEM, VVAL-18M... Does It Really Matter?

At the risk of annoying those who do have a preference for a specific decompression algorithm, the simple answer for most divers is NO the algorithm is not critical. There is no expert consensus that any one of the current crop of decompression algorithms is better than another. All of these algorithms used in dive computers and desktop table generation software, when set to their default conservancy values, will get you out of the water with an acceptable margin of safety. What we can say for sure is they are all imperfect representations of actual decompression in humans.

Numerous variants of ZHL-16C are very widely implemented in both sport and technical dive computers. For technical diving, versions of ZHL-16C that include user configurable Gradient Factor modifications are very popular because the GF values can be 'tuned' to provide different types of profiles for specific types of diving. VPM-B dive profiles typically have deeper initial stops, along with reduced time at shallow depths resulting in a 'smoother' profile although recent research calls into question the benefits of 'deep stops' especially for lengthy VPM-B profiles. DCAP was developed for use by early extended range divers (today we call them 'technical divers'.) VVAL-18M is the basis for the modern US Navy Tables. DCIEM has been extensively tested by the Canadian military to ensure its applicability to cold water working divers. RGBM (basis for NAUI tables with its roots in VPM) and DSAT (basis for PADI tables) are most often seen in no stop required sport diving applications. Recently, the RGBM model has been called in to question by a legal action, but it's not clear if the issue is with the algorithm itself or a specific dive computers' implementation, as most experts consider the RGBM model to be very conservative especially on repetitive dives.

The practices of decompression are not exact, in many ways as much about skill as science. Much of what we do in decompression diving is based on empirical observation and experience, rather than having a basis in theoretical science. Dr. R W (Bill) Hamilton, the late co-developer of DCAP and whose research in decompression is widely acknowledged as having a key role in opening up recreational extreme exposure diving in the early 90s, was fond of the saying 'what works, works'. The most important safety factor is not the decompression algorithm you select, rather your skill as a diver and that you closely follow the recommendations of that algorithm and safe diving practices in general. Also, best practice when diving as a team is that all divers should use the same algorithm in order to remain together as a team during ascent phase of the dive plan.

Garmin Descent G1 Watch Dive Computer

Garmin Descent G1 Watch Dive Computer

$949.00
Sale: $873.08
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Suunto EON Steel Black Wrist Dive Computer

Suunto EON Steel Black Wrist Dive Computer

$1,499.00
Sale: $1,304.13
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Garmin Descent Mk2S Watch Dive Computer

Garmin Descent Mk2S Watch Dive Computer

$1,499.00
Sale: $1,379.08
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Peeping Tom

Bommie Dive Bommie Dive | Boat access Boat access

Abalone Dive Site Crayfish Dive Site Open Water Rated Reef Dive Site Spearfishing Site

Peeping Tom
Peeping Tom
© Google Earth (11/2004)

Depth: 3 m (9.84 ft) to 15 m (49 ft)

Level: Open Water and beyond.

Peeping Tom lies about 3.5 kilometres west of The Crags east of Yambuk and about 12 kilometres west of Port Fairy on Victoria's Discovery Coast. Peeping Tom is a series of bommies that break the surface about 300 to 400 metres offshore. It's a very exposed shore dive site, so it should only be dived when the seas are flat and calm with very little swell.

Dives at Peeping Tom will let you see invertebrate growth as rich and diverse as few other dive sites in Victoria. The second bommie from the east end is very good. The bases of the bommies have some very deep undercuts which provide shelter for plenty of marine life.

Access is by boat from the Port Fairy, Griffiths Street Boat Ramp. Best dived in good conditions with a low swell with light north or northerly winds. See WillyWeather (Pea Soup Beach) as a guide for the tide times and the height of the tide.

{{southern-ocean-warning}}
Abalone Dive Site
Abalone Dive Site
© Mark Norman, Museum Victoria

Divers have the opportunity to catch Abalone at this dive site. Remember your catch bag, legal abalone tool, current Victorian Recreational Fishing Licence, and abalone measure. Please abide by all current fishing regulations if you intend to catch abalone.

See article-catching-abalone for practical abalone hunting advice from The Scuba Doctor, plus melbourne-abalone-dives for a list of other Abalone dive sites near Melbourne.

Crayfish Dive Site
Crayfish Dive Site | © Ian Scholey

Divers have the opportunity to catch Southern Rock Lobster (aka Crayfish) at this dive site. Remember your catch bag, current Victorian Recreational Fishing Licence, rock lobster measure, and cray tags. Once you get back to the dive boat, or shore, make sure you clip the tail and tag your Crayfish as per Fisheries requirements. Please abide by all current fishing regulations if you intend to catch crays. See article-catching-crayfish for practical cray hunting advice from The Scuba Doctor, plus melbourne-cray-dives for a list of other crayfish dive sites near Melbourne. For tips on cooking your Crays, please see article-cooking-crayfish.

Eastern Maar country
Eastern Maar country

Traditional Owners — This dive site is in the traditional Country of the Eastern Maar people of south-western Victoria between the Shaw and Eumerella Rivers and from Yambuk in the south to beyond Lake Linlithgow in the north. This truly ancient Country extends as far north as Ararat and encompasses the coastal townships of Port Fairy in the west, Warrnambool, Peterborough, Port Campbell, Apollo Bay, Lorne, and Airies Inlet in the east, including the Great Ocean Road area. It also stretches 100 metres out to sea from low tide and therefore includes the iconic Twelve Apostles. "Eastern Maar" is a name adopted by the people who identify as Maar, Eastern Gunditjmara, Tjap Wurrung, Peek Whurrong, Kirrae Whurrung, Kuurn Kopan Noot and/or Yarro waetch (Tooram Tribe) amongst others. We wish to acknowledge the Eastern Maar as Traditional Owners. We pay respect to their Ancestors and their Elders, past, present and emerging.

 

Peeping Tom Location Map

Latitude: 38° 21.836′ S   (38.363939° S / 38° 21′ 50.18″ S)
Longitude: 142° 4.212′ E   (142.070206° E / 142° 4′ 12.74″ E)

Datum: WGS84 | Google Map
Added: 2021-07-03 12:24:58 GMT, Last updated: 2022-05-23 19:02:18 GMT
Source: GPS (verified)
Nearest Neighbour: The Crags, 3,554 m, bearing 104°, ESE
Discovery Coast.
Depth: 3 to 15 m.



DISCLAIMER: No claim is made by The Scuba Doctor as to the accuracy of the dive site coordinates listed here. Should anyone decide to use these GPS marks to locate and dive on a site, they do so entirely at their own risk. Always verify against other sources.

The marks come from numerous sources including commercial operators, independent dive clubs, reference works, and active divers. Some are known to be accurate, while others may not be. Some GPS marks may even have come from maps using the AGD66 datum, and thus may need be converted to the WGS84 datum. To distinguish between the possible accuracy of the dive site marks, we've tried to give each mark a source of GPS, Google Earth, or unknown.

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