Scuba diving is a sport where safety is a function of data management. Whether you are a recreational reef explorer or a technical wreck diver, the transition from the surface to depth requires a total immersion in your life-support metrics. A dive completed without a documented SAC (Surface Air Consumption) rate or a verified Surface Interval is an missed opportunity for safety analysis and performance improvement.

The Philosophy of Underwater Stewardship

The "Dive Log" template is designed for the diver who treats every descent as a forensic event. It moves your logbook from a soggy paper notebook to a structured digital archive. By standardizing the capture of the Dive Number, the specific Dive Site, and the GPS Location, the system creates a permanent map of your underwater experience. It acknowledges that a dive at 25 metres requires a different set of safety considerations than a shallow shore dive.

The Blueprint: Gas and Safety Architecture

The structure of this library is built to handle the technical data required for safe gas management.

  • Pressure Dynamics: Dedicated fields for Start Pressure (Bar) and End Pressure (Bar) provide the raw inputs for the system. Memento’s calculation engine then automatically generates the Gas Used, eliminating manual subtraction errors at the end of a long day of diving.
  • The SAC Engine: The template includes a complex script for calculating your SAC rate ((((#{gas used}-#{cylinder size (litres)})/((#{depth (metres)}/10)+1)) / #{time (minutes)}). This is the single most important metric for planning future dives, as it allows you to predict your gas requirements for any depth and duration based on your historical performance.
  • Buddy Accountability: Tracking up to four Buddies per dive ensures that your network of dive partners is documented. This is vital for safety audits and for recalling who was with you during that specific "5/5" (rated) experience.

Usage Scenarios: The Liveaboard Trip

You are on a week-long liveaboard trip in the Red Sea. You are completing three to four dives a day. Instead of trying to remember the details of Dives Today, you open Memento after every ascent. You enter your Depth, Time, and Stops (e.g., 5m/5mins safety stop). You snap a photo of the deck log or an underwater shot for Image #1. The system automatically tracks your Surface Interval between entries, ensuring that your decompression planning is based on current, documented reality.

Power Feature: Thermal and Environmental Analysis

By capturing both Air Temperature and Water Temperature, the template helps you identify patterns in your gas consumption. You might discover that your SAC rate increases significantly in waters below 20 degrees, allowing you to adjust your thermal protection or gas planning for future cold-water dives. It turns a simple log into a powerful diagnostic tool for your underwater physiology.