TDI Tech Trim Diver
Refine your buoyancy, perfect your trim, and build the control required for technical diving
Duration
2 days, 3 dives
Max Depth
23m / 75ft or within current certification level
Level
Transitional / Technical Foundation
Next Step
TDI Advanced Nitrox / TDI Deco Procedures
Overview
The TDI Tech Trim Diver course is designed to enhance a diver’s underwater position, control, and efficiency by focusing on buoyancy, trim, and propulsion techniques.
This programme serves as an introductory step into technical diving, allowing divers to refine core skills while becoming familiar with technical equipment configurations. Training is conducted in a strictly non-decompression environment, ensuring divers can focus on precision and control without additional task loading.
At N9BO℠, this course is where divers eliminate inefficiencies and develop the discipline required for advanced technical training.
Course Facts
- Course name: TDI Tech Trim Diver
- Level: Transitional / technical foundation course
- Minimum prerequisites: Minimum age 18 (15 with parental consent), SDI Open Water Diver or equivalent
- Ratio: A maximum of 6 students per instructor (small groups recommended for quality training)
- Configuration: Single tank, doubles, or sidemount configuration appropriate to training goals
- Depth / environment: Non-decompression dives, max 23m / 75ft or within certification limits
- Format: Academic development + confined water refinement + open water performance dives
- Duration: Typically completed in 2 days (3 open water dives with at least 100 minutes cumulative bottom time)
What You’ll Learn
- Achieve stable buoyancy and precise hovering without movement.
- Maintain horizontal trim throughout all phases of the dive.
- Execute advanced propulsion techniques (frog, modified, backward kicking).
- Improve equipment streamlining and configuration.
- Develop efficient dive planning and gas awareness.
Prerequisites
- Be at least 18 years old (15 with parental consent).
- Be certified as an Open Water Diver (SDI or equivalent).
- Provide proof of at least 25 logged dives.
- Be medically fit for diving.
FAQ
This course is for divers who want to improve control, efficiency, and underwater positioning, and who are preparing to enter technical diving.
No. This is a non-decompression course focused on skill refinement and preparation for technical diving.
You can train in single tank, doubles, or sidemount configurations depending on your goals and progression pathway.
You will complete skill drills focused on buoyancy, trim, propulsion, and equipment handling, along with multiple dives dedicated to refining control and efficiency.
Proper trim and buoyancy reduce gas consumption, improve safety, prevent silting, and are essential for all technical diving environments.
Ready to Perfect Your Diving?
Send us your experience level and training goals. We’ll help you refine your skills and build a solid foundation for technical diving.
Go Pro with TDI Tech Trim Instructor
Take your diving precision to the professional level and start teaching technical diving foundations. Delivered by a TDI Instructor Trainer, this pathway builds the control, discipline, and instructional ability required to train divers to the highest standards.
