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The first two steps in getting certified in scuba diving is to make sure that you are a reasonably proficient swimmer and you get medical clearance from your doctor to take up the sport. As for the swimming, you dont have to master every type of stroke. Scuba certification only requires that you are able to swim about 200 yards using any stroke you want and to be able to float or tread on water for about 10 minutes. If you are in good general health and are comfortable in the water, then you should be able to scuba dive without any problems.

There are about 1,900 professional scuba dive centers in North America alone and your local ones should definitely be checked out. Most will run basic certification programs on a regular basis. These centers or shops should be listed in the yellow pages and you can also check with websites of some of the major scuba diving certification agencies such as PADI or NAUI as they will also have listings. Sometimes scuba diving courses are offered at universities too.

Make sure that the course you are interested in taking as well as its instructor are certified with one of the major scuba diving training agencies. This will ensure that you get proper, safe training for both the technical background knowledge and practical skills required for certification as a scuba diver. You also want to end up with an internationally recognized certification card if you want to go scuba diving at various locations around the world.

Some vacation resorts offer resort courses lasting a day or two which offer beginners some very basic training in order to try out scuba diving. These are not certification programs. Full certification programs involve classroom work, exams, practical skills sessions at a pool and usually about four open water dives in the sea (lake or ocean). The duration of the classroom work and pool sessions vary from a very intensive weekend (with advance reading) to once a week over several weeks. The open water dives will usually take two more days. Dive centers located in the tropics also offer basic certification programs that last several days to a week. Although the intensive weekend programs are quite feasible, many feel that basic scuba diving courses spread out over a few weeks will help beginners learn the skills better. Scuba diving does involve new skills and to learn them all during one full weekend may be too much for some people.

As for which scuba diving certification training agency is the best, there isnt any one recognized organization that is better than another. PADI is the most popular in the world but not necessarily better than NAUI or SSI. NAUI course are often more technical in the classroom than those offered by PADI but both will adequately train you to be a scuba diver. The more important factor would be the individual instructor and your own effort during training/studying. In fact, many scuba diving instructors have certifications from several training agencies.

For people living in the more northern regions, there are a few possible routes to take in order to obtain certification. One can travel down south to the tropics and do the entire basic certification course down there in warm weather. However, this will take up a good portion of a vacation since reading, classroom, pool sessions and open water dives all must be done during that time period. A second option is to take the entire course including the open water dives back in home territory. This usually offers beginners the most time since courses can be spread out over a few weeks. However, the water up north is not as warm as in the tropics and the scuba diving could be seasonal. A third option is to take all the classroom and pool sessions back home and then go down south to do the open water dives in warm waters. Many people have taken this route. Your instructor back home will give you a referral letter to bring down to an instructor located down south who will oversee your open water dives. This is a good combination of taking ample time back home to practice the skills in the pool plus getting the classroom work out of the way followed by having nice warm water to dive in for the open water dives. One thing to be aware of if considering this option is to make sure that your travel to the tropics for your open water dives is not too delayed after finishing up with your pool sessions at home. If too much time has elapsed, one could easily forget the skills learned in the pool by the time a vacation comes along.

The underwater world has so much to offer and only a small percentage of the worlds population will ever have the privilege to see it in person rather than on television. Become one of these individuals who will have the honor of exploring the oceans by getting certified in scuba diving.

Clint Leung is a NAUI certified Master and Rescue Scuba Diver. He is also owner of Free Spirit Activewear http://www.FreeSpiritActivewear.com, an online retailer/designer specializing in premium quality scuba diving activewear. Also numerous articles on scuba diving.

Kismet is a wireless network detector / sniffer which can give you a vast amount of information about wireless networks. wireless network security flaws are well documented but often very hard for the common person to understand. I will be showing you how to use kismet with out even having to install linux, or compile kismet.

first you need to proceed to remote-exploit.org and download and burn their Auditor CD. (IF you dont know how to burn an iso image, go to Google). This version of linux doesnt install or modify your hard drive; it will boot from the CD and use a Ram drive (On your Memory).

Auditor is not only a great tool for testing wireless network security with kismet but it also has many other computer security tools on it as well.

Client window

next, to start Kismet proceed to the linux version of the start menu, and press Auditor. now proceed to the wireless /scanning/kismet tools/kismet.

Once you click on Kismet it will ask you for a default location to place the Kismet log files for analyzing later, just press the desktop or temp file.

now I will show you how to use Kismet. When kismet initially opens you will see a greenish box with numbers and network names (If any are near you) clicking away dont be overwhelmed. (Also I cant show you how to use kismet if you dont have the correct wireless adapter, get an ORINICO gold Classic card off EBAY.) The Orninco gold classic card will be automaticly detected by auditor linux.

The Kismet columns will show the wireless networks ssid (Name), type of device (Access point, gateway) encryption or no encryption, an IP range and number of packets. Kismet will pick up hidden networks with ssid broadcast Disabled also, Netstumbler will not.

now Press H, to bring up the Help Menu. This will give the nuts and bolts on how to use kismet. If you tab down to the network you are auditing and press C, Kismet will show you all the computers that are using that wireless access point / gateway. This Kismet screen will show you the clients mac address, manufacture of wireless adapter, IP address range and traffic.

Kismet: Help Menue

now to get out of that screen press Q. Tab down on the Main Kismet Screen to another ssid and press I. This Kismet window will show detailed information about the wireless network. The Kismet detail screen will show the type of network (Infrastructrure / Adhoc), signal strength, channel, encryption type, and much more.

Kismet will also give you sound alerts when new wireless networks are discovered or security alerts or suspicious clients are in range. Suspicious clients would be people like you who are using Kismet or Networkstumbler. Unlike you these could be Wardrivers looking for venerable networks to hack into.

Kismet alert page

You can prevent War drivers from discovering your wireless network by performing a proper site survey which will help limit signal bleed off to unneeded areas. You should write down the suspicious mac address and keep an eye on your access logs. If the War drivers are really stupid just look out your window and look for cars with weird antennas.HA HA HA.

Kismet is more than just a tool to discover wireless networks; it can be used in conjunction with other tools to crack WEP/WPA. Many websites will claim that wep can be cracked in less that five minutes. This is only half the truth because it could take many hours,days,months to gather enough packets to crack. Good luck and have fun learning the more advanced applications of kismet.

keep your wireless network simple and secure. Join the most popular wireless networking newsletter on the internet http://www.wirelessninja.com

Is it any wonder why almost 80% of homes in North America use asphalt shingles as the roofing material of choice. The prevalence of asphalt shingles has created a vast assortment of fittings and fixtures designed to work with them. Items such as a multitude of flashing configurations, edge products, and almost every skylight manufactured has an appropriate base configuration for a weatherproof connection with asphalt shingles. All of the material that you need for a proper installation, such as the shingles, tarpaper, nails, vent boots and chimney flashing are available at any home improvement retailer.

The primary attributes of asphalt tiles are:

• reasonably priced (economical),
• require very little maintenance,
• versatile,
• provide excellent protection on steep sloped roofs,
• are weather and sunlight resistant,
• easy to cut,
• can be nailed by hand or with powered nailers.

There are two different types of asphalt shingle base material construction - composition and fiberglass. Composition shingles use a base material termed organic felt, which is a blend of paper and wood fibers. Fiberglass, on the other hand, uses a base that is comprised of a fiberglass mat. In both cases, once the base material is produced it is soaked in an asphalt compound. In numbers sold, fiberglass leads the market. They are less expensive, weigh less because they are thinner, have a longer wear life and have a better fire rating than the composition base shingles.

Average cost of a shingle roof is $50 to $150 per square, installed. Removal of old shingles will cost between $30 and $50 per square.

Both types of asphalt shingles are manufactured with embedded mineral granules. Seeing the granules in your eaves trough (after the initial installation) is a sure sign that you need to repair or replace the shingles.

Where just a few years ago asphalt shingles were only available in simple tab configurations in blacks, grays and browns, the manufacturers have expanded their product lines to include a vast array of colors, profiles and with the use of laminate coatings have created as assortment of eye pleasing textures. Special chemicals are also being blended into the shingles to make them mold and algae resistant. Although these additional features do increase the price per square, asphalt shingles are still the most economical roofing material available.

Drawbacks:

The serviceable life of asphalt shingles is the lowest of all the roofing materials. Although they are available in numerous grades designated by the expected life, from 15 to 50 years they often need repair or replacement long before their supposed life has expired. The hotter the climate, the shorter the life of asphalt shingles. Many of the asphalt shingle problems that are encountered by homeowners are a direct result of two factors:

• poor initial installation
• damage due to sever weather

Poor installation usually occurs in the area of deck preparation, and not providing adequate flashing around items that are protruding through the roof such as vent pipes and chimneys. Other poor installation methods are not using the required amount of nails per shingle and nailing in the wrong area of the shingle. There are many fly-by-night roofing companies that will quote low prices, because they won't be around to stand behind the workmanship. Choose a roofing contractor carefully.

Roof Repairs:

You should inspect your shingled roof and all the flashing at least once a year and after any major storm such as a hurricane. Hurricane winds will remove entire shingles and lift others. Sun and rain can cause asphalt shingles to crack. You should also go into the attic and look up, any sign of daylight means that there is a hole. When inspecting the roof look for shingles that have lost the granule minerals - bald spots, cracked and/or curled.

If you have to make a roof repair, choose a warm day so that the shingles will be flexible and unlikely to crack when lifted. The roofing cements also spread easier in warmer temperatures.

You will know when you have a roofing problem when you see beige spots appearing on ceilings and walls close to the ceiling. Beige spots are a sign of water damage.

Maintenance:

Roofing cement is the equivalent of duct tape for roofs. It will repair most leaks, cracked or torn shingles, patch flashing around vent pipes and chimneys. You can also use the roofing cement to cover nail heads that have been exposed.

Shingles fade with age so any replacement shingles used will most likely be visually obvious. Shingle over damaged ridge shingles, by nailing down all the corners of the old shingle first - do not remove them.

If you have to replace an entire shingle, lift each of the tabs and pry the nails out of the shingle of the one that needs to be replaced. Remove the top corners of the replacement shingle and very carefully, without damaging the tarpaper, slip it under the existing shingles.

Use roofing nails (large head, galvanized) to fix the new shingle to the roof decking. Use roofing cement to cover the nail heads.

Planning and knowledge are the keys to any successful home improvement, remodel or landscaping project!

For additional information on roofing materials for your home or other renovation projects, including landscaping, visit Renovation Headquarters