1. One primary light
2. One GUE-approved DPV

The GUE base equipment configuration is comprised of:

1. Tanks/cylinders: Students may use a single tank/cylinder with a single- or dual-outlet valve. Students may also use dual tanks/cylinders connected with a dual-outlet isolator manifold, which allows for the use of two first stages. Dual tanks/cylinders connected with a dual-outlet, non-isolator manifold can be used, but only in recreational (minimum decompression) diving, and are considered an alternative for a single tank/cylinder. Consult course-specific standards and your instructor to verify size requirements.
2. Regulators:
   1. Single tank: The first stage must supply a primary second stage via a 5 to 7 ft/1.5 to 2 m hose. A backup second stage must be necklaced and supplied via a short hose. The first stage must also supply an analog pressure gauge, inflation for the buoyancy compensator (BC), and (when applicable) inflation for a drysuit.
   2. Double tank: One first stage must supply a primary second stage via a 5 to 7 ft/1.5 to 2 m hose (7 ft/2 m hose is required for all cave classes), and inflation for the buoyancy compensator (BC). The other first stage must supply a necklaced backup second stage via a short hose, an analog pressure gauge, and (when applicable) inflation for a drysuit.
3. Backplate system:
   1. Is held to the diver by one continuous piece of webbing. This webbing is adjustable and uses a buckle to secure the system at the waist.
   2. A crotch strap is attached and looped through the waistband to prevent the system from riding up a diver’s back.
   3. The continuous webbing must support five D-rings;
      1. The first placed at the left hip
      2. The second placed in line with a diver’s right collarbone
      3. The third placed in line with the diver’s left collarbone
      4. The fourth and fifth are placed on the front and back of the crotch strap when divers plan to use advanced equipment such as DPVs.
   4. The harness below the diver’s arms has small restrictive bands to allow for the placement of backup lights. The webbing and system retains a minimalist approach.
4. Buoyancy compensation device (BC):
   1. A diver’s BC is back-mounted and minimalist in nature.
   2. It is free of extraneous strings, tabs, or other material.
   3. There are no restrictive bands or restrictive elastic affixed to the buoyancy cell.
   4. Wing size and shape is appropriate to the cylinder size(s) employed for training.
5. At least one time/depth measuring device
6. Wrist-mounted compass
7. Mask and fins: Mask is low-volume; fins are rigid, non-split.
8. Backup mask
9. At least one cutting device
10. Wetnotes with at least one pencil
11. Exposure suit appropriate for the duration of exposure
12. Surface marker buoy (SMB) with spool: Where required, the SMB should be appropriate for environmental conditions and deployed using a spool with at least 100 ft/30 m of line.