The main difference between the Garmin Instinct 2 Solar and the Garmin Instinct 2 Solar Tactical Edition lies in the additional features found in the 'tactical' model. Here are the main differences:

- Tactical Features: The Tactical model includes features specifically for military or tactical use, such as Night Vision mode, Jumpmaster mode to plan the release point for paratroopers, Stealth mode to disable wireless communications and GPS positioning, and a ballistics application for long range shooting (requires separate payment).
- Lighting Modes: The Tactical model has a green LED torch for night vision, while the standard model has a red LED torch for safety.
- Design and Colours: The Tactical model comes in two finishes, Black and Coyote Tan, while the standard model is available in a wider range of colours.
- Basic Functionality: Both models share the same basic functionality, such as water resistance (10 ATM), military protection (MIL-STD-810), and the same display and battery specifications.

The term 'tactical' refers to additional features designed to meet the needs of users who require advanced tools for military or tactical operations. These functionalities are designed for a specific use and are not necessary for most common users.