
TDI and SDI are two common certification programs, but what's the difference? Learn more about the differences between TDI and SDI, as well as the differences in e-services. Learn more about ERDI e-services and PADI eservices. You'll be amazed at how much different these two programs are. So which program is right for you and why? Here are some benefits to both.
TDI vs SDI
The main difference between TDI and SDI is the way they aspirate the air into the combustion chamber. TDI engines come with an exhaust gas turboturbine, which increases the intake of air into the combustion chamber. SDI engines are required to manually aspirate oxygen. Both engines are mostly sold in Europe. However some US manufacturers produce them. You can read more about TDI and SDI engine here!

TDI vs ERDI
Many people ask, "What is ERDI and TDI?" There are many methods to improve your health, and you have the option of a variety of wellness options. However, which one is right for you? Here's a quick comparison between the two. TDI is better for people with osteoporosis, while ERDI is best for people with rheumatoid arthritis.
TDI eServices
TDI eservices provide SSDI members easy access. Members can access their monthly newsletters online, update their addresses and upload photos. Online student registration takes place here. To become certified, students must enter the information and receive verification emails. Reports are also available for members. All employees, managers, as well as administrators can search the information. This resource provides valuable information for all parties.
TDI vs PADI
A few differences can make a difference when comparing a PADI course to a TDI. PADI training is more demanding than TDI and requires more diving experience. TDI offers advanced courses such as Tec Sidemount which is a popular option for aspiring divers. However, while both agencies offer similar certification, there are a few differences.

TDI vs SSI
There are many differences between SSI and PADI certifications. While PADI instructors can work independently, SSI instructors must be affiliated with a dive center or a shop. A crossover course can be taken by PADI instructors to become SSI instructors. This requires you to complete an SSI Instructor Development Course, and pass the PADI Instructor Exam.