What it does
NordTek helps divers check a single recreational no-decompression dive plan, estimate gas needs, calculate SAC/RMV, and check MOD limits.
Recreational dive planning toolkit
Plan your dive.
Check your gas.
Know your limits.
A serious recreational dive planning toolkit for checking no-decompression limits, gas needs, SAC/RMV, MOD, and nitrox top-up without clutter.
Core tools
Choose the tool you need.
Start with the main Dive Planner, or jump into a focused calculator for SAC/RMV, gas, MOD, or nitrox top-up.
Built for quick planning
Practical tools, no distractions.
NordTek keeps the homepage simple and sends divers quickly into the tool they need.
NDL checksTable-style recreational no-stop planning.
Gas awarenessRequired gas, reserve, end pressure, and margin.
Mix supportMOD labels and nitrox top-up tools.
Mobile-firstBuilt toward a practical app-like workflow.
Coming Soon
NordTek will grow step by step without making the current tools harder to use.
User profilesSaved dive plans and personal SAC history.
Dive logSave dives and review gas consumption trends.
Offline appA separate app/PWA workflow after the website is polished.
Tech modeAdvanced features only after the recreational mode is solid.
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NordTek Dive Planner is a practical planning aid for scuba divers.
It is not a substitute for proper training, experience, agency standards, gas analysis, dive computers or sound judgment. You are responsible for your own dive decisions.
About NordTek
Recreational dive planning, kept simple.
NordTek Dive Planner is built as a practical planning aid for recreational scuba divers. The goal is to keep the app clean, fast and understandable before adding advanced systems like accounts, saved plans and future technical diving modes.
About NordTek Dive Planner
NordTek Dive Planner is a free recreational scuba diving planning tool designed to help divers estimate no-decompression limits, gas requirements, reserve volumes and dive logistics.
The planner provides quick calculations to support safer planning, while keeping the current app focused on recreational diving before advanced features like user accounts, saved plans and future technical modes are added.
Current focus
- Recreational air dive planning
- No-stop limit awareness
- Gas and reserve checks
- Simple mobile-friendly UI
Not a substitute
This planner does not replace formal training, agency standards, dive computers, tables, gas analysis, local procedures, or real judgment before a dive.
Future direction
- User profiles and saved plans
- Repetitive dive planning
- Nitrox Top-Up improvements
- Separate technical mode later
Help / Reference
NordTek reference and FAQ.
Use this page to understand what the current beta tools do, how NordTek calculates results, and where the important limitations are. The full learning library and contact mailbox will grow after the v1.5 release.
Current beta limitations
Beta v1.5 does not support repetitive dives, decompression planning, multi-gas dive plans, personal dive computer algorithms, ascent profiles, environmental conditions, emergency gas sharing or instructor-level planning decisions.
What NordTek is
NordTek Dive Planner is a recreational dive planning aid. It helps you check a planned dive, estimate gas use, calculate SAC/RMV, check MOD, and review nitrox top-up math.
What NordTek is not
NordTek is not a dive computer, instructor, certification agency, decompression planner, gas analyzer, or replacement for training and judgment.
Dive Planner
- Single recreational air dive only in Beta v1.5
- Depth is rounded up to the next table depth
- NDL + Gas mode adds a gas consumption check
- Repetitive dives and nitrox table planning are not included yet
SAC / RMV Calculator
NordTek calculates surface-equivalent gas consumption from cylinder size, pressure used, dive time, and average depth. Use real dive data, not guessed numbers.
Gas Planner
Gas required is estimated from SAC/RMV × ATA × time. NordTek uses planned maximum depth for a conservative gas check and subtracts the selected reserve before judging usable gas.
MOD Calculator
MOD is calculated from oxygen percentage and selected PPO₂. Always analyze your gas, label cylinders, match your computer settings, and follow your training limits.
Nitrox Top-Up
This beta tool is only a top-up math estimate for trained gas blenders using appropriate oxygen-clean equipment and procedures. Always analyze the final cylinder before diving.
Accounts and saved plans
User profiles, saved dive plans, personal SAC history, and dive logs are planned for later. Beta v1.5 keeps the calculators usable without login.
Feedback and contact
A proper contact channel will be added later. For Beta v1.5, the focus is keeping the planning tools stable before adding feedback forms, accounts and saved plans.
Account
Accounts are coming later.
Accounts, saved dive plans, personal SAC/RMV history, and dive log saving will be added in a future NordTek version. For now, the calculators work without an account.
Beta v1.5 · Recreational mode
Dive Planner
Single-dive NDL check with optional gas consumption.
Single recreational air dive only. Enter your own depth and time, then calculate the plan.
Planned Maximum Depth
M
Planned Bottom Time
MIN
Safety Stop
Enter your dive details and press Calculate
NordTek will check the selected no-decompression planning limit.
Table Depth Used
—
No-Stop Limit
—
NDL Remaining
—
Safety Stop
—
Required fields are intentionally blank so the plan is based on your own inputs.
How this planner works
NordTek checks a single recreational air dive against a simple no-stop limit table. Your planned depth is rounded up to the next available table depth for a more conservative check.
What NDL means
NDL means no-decompression limit. It is the maximum planned bottom time at a given depth before mandatory decompression procedures would be required by the selected table/computer model.
Limitations and safety notes
Beta v1.5 is for single recreational air dives only. It does not yet handle repetitive dives, surface intervals, residual nitrogen, nitrox table planning, decompression planning or personal computer algorithms.
Beta v1.5 uses a simplified first-dive air no-stop limit lookup based on public NOAA table depths. Repetitive dives and nitrox table planning are planned for later versions.
Beta v1.5 · Recreational mode
SAC Calculator
Calculate your surface-equivalent gas consumption from real dive data.
Presets only fill the cylinder volume. You can still enter any size manually, for example 18L.
Cylinder Volume
L
Starting Pressure
BAR
Ending Pressure
BAR
Dive Time
MIN
Average Depth ?
M
Your Gas Consumption Rate
—L/min
—
Surface-equivalent gas consumption based on your real dive data.
SAC/RMV varies with workload, stress, equipment, current, temperature, buoyancy and experience.
How SAC / RMV is calculated
NordTek uses: gas used in litres ÷ dive time ÷ ATA at average depth. Gas used is calculated from cylinder volume × pressure used.
SAC vs RMV — what's the difference?
SAC and RMV are often used interchangeably by recreational divers. NordTek reports a surface-equivalent litres-per-minute rate that is closer to RMV, while keeping the familiar SAC wording.
Don't know your average depth?
For a more accurate SAC test, descend to a stable depth such as 10–15 m, swim normally for 10–15 minutes, and record start pressure, end pressure, time and depth.
Enter your cylinder, planned profile, safety stop, reserve and SAC/RMV, then calculate the gas estimate.
Presets only fill the cylinder volume. You can still enter any size manually, for example 18L.
Cylinder Volume
L
Cylinder Fill Pressure
BAR
Planned Maximum Depth
M
Planned Dive Time
MIN
Planned time is treated as the main dive/profile time. Add a safety stop below if you want it included in the estimate.
Safety Stop
Minimum Reserve Pressure
BAR
Your Gas Consumption Rate ?Calculate yours ›
L/MIN
SAC vs RMV — What's the difference?
SAC and RMV are often used interchangeably. NordTek calculates surface-equivalent gas consumption in L/min, which is technically RMV-style, while SAC is the familiar recreational term.
—
—
Gas Required
—
Usable Gas
—
End Pressure
—
Safety Margin
—
Reserve Remaining
—
How gas required is calculated
NordTek uses: Gas Required = SAC/RMV × ATA × Time, plus the selected safety stop if included. ATA increases with depth, so gas use rises as the dive gets deeper.
Why NordTek uses planned maximum depth
Gas planning is more conservative when it uses planned maximum depth instead of average depth. This helps account for ascent delays, workload, buddy issues and safety stops.
Why reserve pressure matters
The reserve is gas you intend not to use during the main dive. NordTek subtracts reserve gas before deciding whether the planned profile has enough usable gas.
Enter the analyzed gas mix and PPO₂ limit, then calculate the maximum operating depth.
Gas Type
O₂ Percentage
%
PPO₂ Limit
Maximum Operating Depth
—m
—
MOD Label
—
Calculated MOD
—
Label MOD
—
Calculated MOD is shown with one decimal. Label MOD is rounded down to the nearest metre.
PPO₂ Limit
—
Analyzed O₂
—
Date: __________ Initials: __________
What MOD means
MOD is the maximum operating depth for a gas at a selected PPO₂. Going deeper increases oxygen partial pressure and oxygen exposure risk.
Why NordTek uses PPO₂ 1.4 as standard
1.4 is commonly used as a working planning limit by many divers. Some divers choose 1.2 or 1.3 for a more conservative plan, while 1.6 is often treated as a contingency or decompression limit rather than a normal working limit.
Limitations and safety notes
Always analyze your gas, label the cylinder, match your dive computer settings, and follow your training and agency limits. NordTek shows the calculated MOD in the result and rounds the label MOD down to the nearest metre.
Nitrox Top-Up estimate for trained gas blenders only. Enter the current cylinder pressure, current mix, target pressure and target mix.
Current Pressure
BAR
Current O₂ Percentage
%
Target Final Pressure
BAR
Target O₂ Percentage
%
—
—
Add O₂
—
O₂ Stop Pressure
—
Add Air
—
Estimated Final Mix
—
What this tool is for
This tool estimates oxygen-first and air top-up pressures for a Nitrox Top-Up. Technically this uses pressure-contribution math, but the result is shown as simple bar values.
Important fill safety note
This is an ideal pressure estimate for trained gas blenders using appropriate oxygen-clean equipment and procedures. Actual fill procedures, temperature settling, analyzer readings and local standards may differ. The finished cylinder must always be analyzed and labeled before diving.