A PADI Open Water Diver referral allows you to complete the initial stages of your scuba diving certification (knowledge development and confined water training) in one location, then finish the final open water dives at a different location, perhaps during a vacation. This is a convenient way to get certified, especially if you're traveling and want to avoid dedicating time to the course while on vacation.

Here's a breakdown of what it entails:

1. Complete the Initial Stages Locally:

• You'll take the PADI Open Water Diver course, but instead of finishing all the training in one place, you'll complete the first two phases (knowledge development and confined water training) with a local PADI instructor.
• This includes learning about scuba diving theory, practicing skills in a pool, and completing the required dives.
• Once you've successfully completed these initial stages, your local instructor will sign you off and provide you with a referral to complete your open water dives elsewhere. 

2. Finish Your Certification on Your Trip:

• You can then book a referral course with a PADI instructor at your destination (e.g., a dive center on a vacation). 
• They will guide you through the final four open water dives, which will be the last step in your certification process. 
• This allows you to enjoy your vacation and complete your scuba diving certification without having to take time for the full course during your trip.