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Underwater Compasses


Many divers take diving compasses for granted, considering them just an accessory to an overall dive gauge console system. Trying to navigate with a poorly designed or improperly functioning compass can be one of diving's more frustrating events.

Compasses vary in greatly in where they are worn/attached and this is down to personal diver preference. From wrist mounted compasses with straps or bungees to a gauge mounted compass, we have every variation

We only stock the very best underwater and diving compasses to ensure that you are on track at all times. We use and recommend the Suunto range of wrist mount dive compasses, but have plenty of options from other brands like Cressi as well.

Technical Tip

Compass Balance Zones

Compasses are designed for use within a certain area of the globe because the earth's magnetic field not only varies horizontally, but also vertically, causing the needle to dip downward when the case is held level. The compass needle card is balanced with a small weight to counteract the downward dip so the needle card does not drag or stick on the top or bottom of the capsule. If you take any compass to a significantly different part of the globe than where it was balanced, check the compass carefully before relying upon it. The compasses we sell are balanced for the southern hemisphere.

Digital Compasses

Note that digital compasses, like the ones becoming popular in dive computers, do not have balance zones. Digital compasses are universal because they have a user 'calibration' feature, which is performed in the region where the diver plans to use the compass. A change in region simply requires a recalibration before use in the new location



Grant Bay Reef

Reef Dive Reef Dive | Boat access Boat access

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

Cape Grant Dive Sites
Cape Grant Dive Sites
© The Scuba Doctor Australia

Depth: 5 m (16 ft) to 12 m (39 ft)

Level: Open Water and beyond.

Grant Bay Reef lies about 400 metres offshore, in the middle of Grant Bay, about eight kilometres south of Portland, on Victoria's Discovery Coast. The reef is south of the Portland aluminium smelter.

Grant Bay, also known as Crayfish Bay, is located between Point Danger to the east and Cape Sir William Grant to the west. Grant Bay faces south into the Southern Ocean.

Diving at Grant Bay Reef

Grant Bay Reef has lots of interesting reef structure with plenty of great habitat for the marine life found here. It's a good hunting ground for abalone and crayfish.

Location: Grant Bay, Portland, Victoria 3305

Ideal Conditions: Grant Bay Reef is protected from offshore north-westerly to north-easterly winds. Moderate to strong easterly to southerly winds are not favourable at this location. Best dived in calm conditions with a low swell. See WillyWeather (Grant Bay) as a guide for the tide times and the height of the tide.

Grant Bay Reef ia accessed by boat from the Portland Harbour, Lee Breakwater Road North Ramp or the Portland Harbour, Lee Breakwater Road South Ramp.

{{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.

Gunditjmara country
Gunditjmara country

Traditional Owners — This dive site is in the traditional Country of the Gunditjmara people of far south-western Victoria which continues over the state border into a small part of south-east South Australia and is bordered by the Glenelg River to the west and the Wannon River in the north. This truly ancient Country extends 100 metres out to sea from low tide and also includes Deen Maar (aka Lady Julia Percy Island) where the Gunditjmara believe the spirits of their dead travel to wait to be reborn. We wish to acknowledge the Gunditjmara as Traditional Owners. We pay respect to their Ancestors and their Elders, past, present and emerging.

 

Grant Bay Reef Location Map

Latitude: 38° 23.776′ S   (38.396267° S / 38° 23′ 46.56″ S)
Longitude: 141° 38.072′ E   (141.63454° E / 141° 38′ 4.34″ E)

Datum: WGS84 | Google Map
Added: 2022-05-23 14:13:07 GMT, Last updated: 2022-05-24 07:33:51 GMT
Source: GPS
Nearest Neighbour: Grant Bay Beach, 750 m, bearing 286°, WNW
Grant Bay, Portland, Discovery Coast.
Depth: 5 to 12 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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