5 ARENA

The

includes all elements of the game infrastructure that are required to play REBUILTTM presented by Haas: the , SCORING ELEMENTS, queue area, team media area (when available), designated area, and all equipment needed for , , and scorekeeping.

5.1 Dimensions and Accuracy

All official models for the REBUILT

were created in Onshape.

The specification for the REBUILT

can be retrieved from a few locations:

• The 3D CAD model is the official representation of the REBUILT
  FIELD
  and how it is constructed.
• Illustrations included in this section are for a general visual understanding of the REBUILT
  ARENA
  , and dimensions included in the manual are nominal and no tolerances are implied. Please refer to the official drawings for exact dimensions, tolerances, and construction details.
• The
  Field
  Dimension Drawings package has critical dimensions for each
  FIELD
  element.
• The
  FIELD
  Manual (coming soon) includes instructions on how to build the
  FIELD
  along with showing the ways construction type will influence the
  field
  tolerances. It also includes many of the key dimensions which are listed in the Official
  FIELD
  Drawings.
• The
  FIELD
  Acceptance Checklist (coming soon) includes the controlled dimensions (with relevant tolerances) which will be checked by event staff a few times throughout the event. The
  FIELD
  is expected to change during
  MATCH
  play. Teams can ask the
  FTA
  to re-check specific measurements if they believe something is out of spec prior to a
  MATCH
  beginning.

The official drawings, CAD models, and drawings for low-cost versions of important elements of the REBUILT

are posted on the Playing

FIELD

webpage.

5.2

FIELD

Each

for REBUILT is an approximately 317.7in (~8.07m) by 651.2in (~16.54m) carpeted area bounded by inward facing surfaces of the WALLS, , WALLS, and guardrails.

The

is populated with and surrounded by the following elements:

• 1
  OUTPOST
  per
  ALLIANCE
  ,
• 1
  HUB
  per
  ALLIANCE
  ,
• 1
  TOWER
  per
  ALLIANCE
  ,
• 2
  DEPOTS
  ,
• 4
  BUMPS
  , and
• 4
  TRENCHES
  .

The surface of the

is low pile carpet, Shaw Floors, Philadelphia Commercial, Neyland II 20, “66561 Medallion.” Neyland II carpet is not available for purchase at this time, and the closest equivalent is Shaw, Philadelphia Brand, Profusion 20, Style 54933; see results from evaluation in this blog post.

Carpet edges and seams are secured with 3MTM Premium Matte Cloth (Gaffers) Tape GT2, GT3 or comparable Gaffer’s Tape. Tears, rips, and damage to the carpet may be repaired with the same styles of tape and

must be prepared to operate on surfaces made of carpet, tape, or combinations of both materials as repairs are made through the course of competition.

Guardrails form the long edges of the

. Guardrails are a 20.0in (50.8cm) tall system of transparent polycarbonate supported on the top and bottom by aluminum extrusion. There are 4 gates in the guardrail that allow access to the for placement and removal of . The gate passthrough, when open, is 38.0in (96.5cm) wide. Gates are closed and shielded during the .

There are 2 versions of guardrails and

STATIONS used for competitions. 1 design is the Welded which is reflected in the 2026 Official FIRST

FIELD

Drawings & Models. The other is designed and sold by AndyMark. Table 5‑1 and

Table 5‑2 illustrate which areas have each kind of

. While the designs are slightly different, the critical dimensions, performance, and expected user experience between them are the same unless otherwise noted. Detailed drawings for the AndyMark design are posted on the AndyMark website. All illustrations in this manual show the traditional Welded design.

District	Field Type
FIRST Chesapeake	AndyMark
FIRST California	Welded
FIRST in Michigan	Welded
FIRST in Texas	AndyMark
FIRST Indiana Robotics	AndyMark
FIRST Israel	Welded
FIRST Mid-Atlantic	Welded
FIRST North Carolina	AndyMark
FIRST South Carolina	Welded
FIRST Wisconsin	AndyMark
NE FIRST	AndyMark
Ontario	Welded
Pacific Northwest	Welded
Peachtree	Welded

Regional Location	Field Type
Australia	Welded
Brazil	AndyMark
Canada	Welded
China	AndyMark
Mexico	AndyMark
Türkiye	AndyMark
United States	Welded

5.3 Areas, Zones, & Markings

areas, zones, and markings of consequence are described below. Unless otherwise specified, the tape used to mark lines and zones throughout the is 2.0in (5.1cm) 3M™ Premium Matte Cloth (Gaffers) Tape (GT2), ProGaff® Premium Professional Grade Gaffer Tape, or comparable gaffers tape.

• ALLIANCE
  AREA: an approximately 360in wide by 134in deep (~9.14m by 3.4m) infinitely tall volume formed by, and including the
  ALLIANCE
  WALL,
  OUTPOST
  ,
  TOWER
  WALL, the edge of the carpet, and
  ALLIANCE
  colored tape perpendicular to the
  DRIVER
  STATIONS.
• ALLIANCE
  ZONE: A 158.6in deep by 317.7in long (~4.03m by 8.07m), infinitely tall volume formed by an
  ALLIANCE
  WALL,
  TOWER
  WALL, and guardrails. It surrounds an
  ALLIANCE
  TOWER
  and a
  DEPOT
  . It is bounded by and includes the
  ROBOT
  STARTING LINE.
• CENTER LINE: a white line that spans the width of the
  FIELD
  that bisects the NEUTRAL ZONE in half.
• NEUTRAL ZONE: A 283in deep by 317.7in long (7.19m by 8.07m), infinitely tall volume formed by the
  BUMPS
  ,
  TRENCHES
  ,
  HUBS
  , and guardrails. It surrounds and includes the CENTER LINE.
• HUMAN STARTING LINE: a white line spanning the
  ALLIANCE
  AREA up to the
  OUTPOST
  AREA that is parallel to and located 24.0in (61.0cm) from the bottom square tube of the
  ALLIANCE
  WALL to the near edge of the tape.
• OUTPOST
  AREA: a 71.0in wide by 134in deep (1.8m by 3.4m) infinitely tall volume bounded by the
  OUTPOST
  , edge of carpet, and
  ALLIANCE
  and white colored tape.
• ROBOT
  STARTING LINE: an
  ALLIANCE
  colored line that spans the width of the
  FIELD
  at the edge of an
  ALLIANCE
  ’S BASE in front of two BARRIERS and an
  ALLIANCE
  HUB
  .

5.4

HUB

A

is one of two 47in by 47in (~1.19m by 1.19m) rectangular prism structures with an extended opening at the top surface. Each has a dedicated centered between two located 158.6in (~4.03m) away from their WALL. Each has a set of exits that randomly distributes into the NEUTRAL ZONE. A net structure located in the back of the prevents launched from most prohibited areas from entering the opening.

The top of each

has a 41.7in (~1.06m) hexagonal opening into which can deliver . The front edge of the opening is 72in (~1.83m) off the carpet.

have a series of exits at the base of the facing towards the NEUTRAL ZONE. processed through the are distributed into the NEUTRAL ZONE via one of four exits as shown in Figure 5‑8. Examples of distribution from the can be found on the Playing

FIELD

webpage.

The top angles of the

are lit by DMX light bars that indicate if the is active. See Table 5‑3 for more details about the various light states in the .

Color	Pre-MATCH	MATCH	Post-Match
ALLIANCE color at 100% brightness	N/A	HUB active	N/A
ALLIANCE color pulsing	N/A	HUB deactivation warning. Starts 3 seconds before and continues until deactivation.	N/A
Purple	N/A	N/A	FIELD is safe for FIELD STAFF.
Green	N/A	N/A	FIELD is safe for all.
Off	MATCH ready to start.	HUB is not active.	N/A

5.5

BUMP

are 73.0in (1.854m) wide, 44.4in (1.128m) deep, and 6.513in (16.54cm) tall structures on either side of the that drive over. The top surface of each is made up of 0.5in (1.27cm) thick, colored, Orange Peel textured, HDPE ramps at a 15-degree angle with one ramp sloping down towards the NEUTRAL ZONE and the other ramp sloping down towards the ZONE.

5.6

TRENCH

are a 65.65in (1.668m) wide, 47.0in (1.194m) deep, and 40.25in (1.022m) tall structure that drive underneath. The extends from the guardrail to the on both sides of the . The space underneath each arm is 50.34in (1.279m) wide, 22.25in (56.52cm) tall.

along the guardrail closest to the scoring table contain additional electronics to reach the . The along the guardrail furthest from the scoring table have a pivot arm that allows the horizontal portion of the to rotate into a vertical position for post-MATCH retrieval and to let staff reset the between . The pivot arm will be locked in the horizontal position during the .

5.7

DEPOT

A

is a 42.0in (1.07m) wide, 27.0in (68.6cm) deep structure located along the WALL. There is 1 per . are made up of 3.0in (7.62cm) wide, 1.0in (2.54) tall steel barriers. The is secured to the carpet using hook fastener which increases the height to approximately 1.125in (2.86cm).

5.8

TOWER

A

is a 49.25in (1.251m) wide, 45.0in (1.143m) deep, and 78.25in (1.988m) tall structure made up of the WALL, BASE, , and supporting structures. There is 1 per . A is integrated into each WALL between STATION 2 and STATION 3.

The

BASE is a 39.0in (99.06cm) wide by 45.18in (1.148m) deep plate that sits on the floor and extends from the WALL. The BASE is powder-coated steel with hook fastener underneath. The edges of the BASE are approximately 0.2in (0.5cm) to 0.3in (0.8cm) tall.

The

are two 72.1in (1.831m) tall, 1.5in (3.81cm) thick, 3.5in (8.89cm) deep sheet metal box frames that extend vertically up from the BASE. The distance between each is 32.25in (81.92cm).

The

hold three horizontal made up of 1-1/4in Sch 40 (1.66in (4.216cm) OD) pipe. Each is centered between the and extend 5.875in (14.92cm) from the outer face of the on either side. The center of the LOW is located 27.0in (68.58cm) from the floor. The center of the MID is located 45.0in (114.3cm) from the floor. The center of the HIGH is 63.0in (1.6m) from the floor. The are 18.0in (45.72cm) apart center to center.

The

and are powder-coated red or blue.

Each

has additional supporting structures extending from the to the WALL between approximately 28.40in (72.14cm) and 43.38in (1.102m) off the floor.

5.9

ALLIANCE

WALL

The

WALL separates from DRIVE TEAM members in the AREA. It consists of 3 STATIONS, an , and a WALL.

5.9.1

DRIVER

STATIONS

A

STATION is 1 of 3 assemblies within an WALL behind which a DRIVE TEAM operates their . Each STATION is made from a 36.8in (93.5cm) tall diamond plate base topped with a 42in (1.07m) tall transparent plastic sheet and a top rail.

An aluminum shelf is attached to each

STATION to support an OPERATOR CONSOLE. The shelf is 69in (1.75m) wide and 12.25in (31.1cm) deep. There is a 54.0in (1.372m) long by 2.0in (nominal) wide strip of hook-and-loop tape (“loop” side) along the center of the support shelf that may be used to secure the OPERATOR CONSOLE to the shelf. The shelf also includes two clips to hold the shelf in place with a 1.0in (2.5cm) wide by 2.0in (5.1cm) deep tab that sits on the top surface of the shelf.

There is a 6.0in (15.2cm) tall sponsor panel in each

STATION. The top of this panel is 42.9in (1.09m) from the carpet.

Each

STATION contains the following elements for DRIVE TEAMS:

• 1 Ethernet cable: attaches to the Ethernet port of the OPERATOR CONSOLE and provides connectivity to the
  FIELD
  Management System (
  FMS
  ).
• 1 120VAC NEMA 5-15R power outlet (i.e. standard US outlet): located on each
  DRIVER
  STATION shelf and protected by its own 2-Amp circuit breaker. It can be used to power the OPERATOR CONSOLE. DRIVE TEAMS are responsible for monitoring their power consumption as a tripped breaker in the outlet does not constitute an
  ARENA
  FAULT. For some events in regions that don’t use NEMA 5-15 shaped outlets, event organizers may install appropriate plug adapters to be used throughout the event.
• 1 Emergency Stop (E-Stop) button: located on the left side of the
  DRIVER
  STATION shelf and is used to deactivate a
  ROBOT
  in an emergency.
• 1 Autonomous Stop (A-Stop) button: located on the right side of the
  DRIVER
  STATION shelf and is used to DISABLE a
  ROBOT
  during
  AUTO
  .
• 1 team sign: located at the top of each
  DRIVER
  STATION. The
  FIELD
  facing side of the sign displays the team number in the
  ALLIANCE
  color. The
  ALLIANCE
  AREA side of the sign displays the following information in red:
• o Pre-MATCH: team number and
  ROBOT
  connection state
• o During Qualification
  MATCHES
  :
• Current
  SHIFT
  and time remaining in that period,
• A shows for
  AUTO
  when both
  ALLIANCE
  ’s
  HUBS
  are active
• T shows for the TRANSITION
  SHIFT
  when both
  ALLIANCE
  ’s
  HUBS
  are active
• R
  shows when the Red
  ALLIANCE
  ’S
  HUB
  is active
• B shows when the Blue
  ALLIANCE
  ’S
  HUB
  is active
• E shows for END GAME when both
  ALLIANCE
  ’s
  HUBS
  are active
• Progress towards the
  FUEL
  Ranking Points. This shows total scored out of the ENERGIZED
  RP
  and once that threshold passes it shows out of the SUPERCHARGED
  RP
• AUTO
  TOWER
  points, and
• remaining
  MATCH
  period time.

• o During the
  MATCH
  during Playoff
  MATCHES
  :
• Which
  MATCH
  period is active and time remaining in that period,
• MATCH
  scores, and
• remaining
  MATCH
  period time.

• 1 timer (in
  DRIVER
  STATION 2 only): displays the official time remaining in the
  MATCH
  period on the FIELD-facing side (in white) and on the team facing side the following information in red:
• o remaining
  MATCH
  period time, and
• o
  MATCH
  scores.

• 1 team LED stack: indicates
  ALLIANCE
  color,
  ROBOT
  status, E-Stop and A-Stop status, and is centered at the top of each
  DRIVER
  STATION. The stack includes 2 identical ALLIANCE-colored
  ROBOT
  status LEDs above a third amber A-stop/E-stop LED. LED states are as follows:
• o
  ROBOT
  status LEDs
• Solid: indicates that the
  ROBOT
  is connected and enabled. This only happens during a
  MATCH
  .
• Blinking: indicates that either the
  FMS
  is preset for the
  MATCH
  and the
  ROBOT
  is not connected yet, or it’s during a
  MATCH
  and the corresponding
  ROBOT
  has lost connectivity, or the E-stop was pressed.
• Off: indicates that the
  ROBOT
  is linked and
  DISABLED
  prior to the start of the
  MATCH
  , or the
  ROBOT
  is
  BYPASSED
  . This light is also off, regardless of
  ROBOT
  connection status, after the
  MATCH
  has concluded.
• o A-Stop/E-stop LED
• Solid: the
  ROBOT
  is
  DISABLED
  due to a press of the team E-stop button, the
  FIELD
  E-stop button, or by the scorekeeper via the
  FMS
  .
• Blinking: the
  ROBOT
  is
  DISABLED
  for the remainder of
  AUTO
  due to a press of the team A-Stop button.
• Off: the
  ROBOT
  is not
  DISABLED
  by the
  FIELD
  .
• FMS
  hardware and wiring: mostly located below shelves in the 2
  DRIVER
  STATIONS closer to the scoring table.

5.9.2

OUTPOST

An

is an assembly through which HUMAN PLAYERS feed into the and can deliver to their HUMAN PLAYERS. There are 2 , 1 on either end of the connecting the guardrail to the WALL. Each has a 31.8in (80.8cm) wide by 7.0in (17.8cm) tall opening through which passes to the . The bottom of the opening is 28.1in (71.4cm) off the floor.

A 15.0° sloped tunnel, called the

, leads to the upper opening in the . The can hold approximately 25 at a time retained by the DOOR. The DOOR is an HDPE arm on a pivot that can be rotated approximately 90 degrees by the HUMAN PLAYER to open or close the .

At the base of the

is an opening 32.0in (81.3cm) wide by 7.0in (17.8cm) tall where can push into the . The bottom of the opening is 1.88in (4.77cm) off the ground. The opening is divided in the center by a vertical 1-1/4in Sch 40 (1.66in (4.216cm) OD) pipe. The is made up of 8.13in (20.6cm) tall polycarbonate panels that create a 35.8in (90.8cm) wide, 37.6in (95.5cm) deep area on the floor in which can be stored.

The

and each feature an ALLIANCE-colored tape line that indicates where DRIVE TEAMS may be restricted from reaching. The near edge of the tape is 12.7in (32.3cm) from the FIELD-facing wall of the . The near edge of the tape line is 12.9in (32.8cm) from the FIELD-facing wall of the .

5.10 SCORING ELEMENTS

SCORING ELEMENTS are items that teams use to score points. There is one type of SCORING ELEMENT used in REBUILT:

.

5.10.1

FUEL

A

is a 5.91in (15.0cm) diameter, high density foam ball. is a custom made SCORING ELEMENT available for purchase on the AndyMark website, am-5801.

has a weight of between 0.448-0.500lb (~0.203-0.227kg).

undergoes wear and tear during a competition. Generally, a that still appears to look approximately like a is considered a for the purposes of rule evaluation and scoring, whether damaged or not. Small chunks of a are not considered a .

5.11 AprilTags

AprilTags are 8.125in (20.64cm) square targets located on the

, WALL, , and . There are 32 unique markers on the positioned as shown in Figure 5‑21.

All markers are from the 36h11 tag family, IDs 1-32. All AprilTags are mounted to and centered on a 10.5in (26.67cm) square polycarbonate panel. Each marker has an identifying text label. If AprilTags experience wear and marking during

they are repaired with gaffers tape.

AprilTags (IDs 2, 3, 4, 5, 8, 9, 10, 11, 18, 19, 20, 21, 24, 25, 26, 27) are located on all four faces of the . Each face has two AprilTags with centers located 44.25in (1.124m) off the floor as shown in Figure 5‑23. One AprilTag per face is centered and the other AprilTag is horizontally offset.

Two AprilTags (IDs 15, 16, 31, 32) are located on each

WALL with centers 21.75in (55.25cm) off the floor as shown in Figure 5‑24. One AprilTag per is centered and the other AprilTag is horizontally offset.

Two AprilTags (IDs 13, 14, 29, 30) are located on each

with centers 21.75in (55.25cm) off the floor as shown in Figure 5‑25. One AprilTag per is centered with the and openings and the other AprilTag is horizontally offset.

AprilTags (IDs 1, 6, 7, 12, 17, 22, 23, 28) are attached to mounting brackets located on the top surface of the horizontal arm of the . Each has two AprilTags, one facing the ZONE and one facing the NEUTRAL ZONE. AprilTags are approximately centered on the opening under the arm and their centers are located 35in (88.9cm) off the floor as shown in Figure 5‑26.

For further marker locating information please refer to the 2026

Dimension Drawings. Printable copies of the AprilTags can be found on the Playing

FIELD

webpage.

5.12 The

FIELD

Management System

The

Management System () is all the electronics responsible for sensing and controlling the FIRST Robotics Competition . The encompasses all electronics, including computers, touchscreens, the wireless access point, sensors, stack lights, A-Stops and E-Stops, etc.

When a DRIVE TEAM connects the Ethernet cable from their assigned

STATION to their OPERATOR CONSOLE, the Station Software on the OPERATOR CONSOLE computer communicates with . Once connected, the open ports available are described in Table 8‑5.

Note that

code cannot be deployed while connected to the . Additional information about the may be found in the

FMS

Whitepaper.

The

alerts participants to milestones in the using audio cues detailed in Table 5‑4. Please note that audio cues are intended as a courtesy to participants and not intended as official markers. If there is a discrepancy between an audio cue and the timers, the timers are the authority.

Event	Timer Value(s)	Audio Cue
MATCH start	0:20 (for AUTO )	“Cavalry Charge”
AUTO ends	0:00 (for AUTO )	“Buzzer”
TELEOP & TRANSITION begins	2:20	“3 Bells”
ALLIANCE SHIFT starts	2:10 1:45 1:20 0:55	None
END GAME begins	0:30	“TBD”
MATCH end	0:00	“Buzzer”
MATCH stopped	n/a	“Foghorn”

5.13

FIELD

STAFF

STAFF are responsible for making sure the are cycled through efficiently, fairly, safely, and with a spirit of cooperation, Gracious Professionalism, and generosity of spirit. STAFF roles are filled by volunteers from the community who prepare for the event with thorough training and certification. There are 3 FIELD-side key volunteer roles with whom teams should be familiar and are encouraged to use as resources to make their event experience valuable (in whatever way the team defines “valuable”).

• Head
  REFEREE
  – trains, directs, and supervises
  REFEREES
  . They oversee all scoring processes and procedures in collaboration with the FIRST Technical Advisor (
  FTA
  ). They interact with
  STUDENTS
  , volunteers, and contracted/FIRST staff. The Head
  REFEREE
  is positioned between the
  FIELD
  and the scoring table and wears a yellow shirt. The Head
  REFEREE
  has final authority for decisions regarding
  MATCH
  scores, penalties, and YELLOW and RED CARD assignments. For additional details, please refer to the Head
  REFEREE
  role description.
• FIRST Technical Advisor (
  FTA
  ) - ensures events run smoothly, safely, and in accordance with FIRST requirements. The
  FTA
  collaborates with FIRST staff, event staff, and other event volunteers in many different areas at events. The
  FTA
  is the liaison between FIRST HQ and the event for all things related to the
  FIELD
  ,
  ROBOTS
  , and game, acts as a team advocate for all teams competing at the event and is a major point of escalation and conflict resolution for the event. For additional details, please refer to the
  FTA
  role description.
• FIELD
  Supervisor - directs activity on the
  FIELD
  to ensure efficient execution of the
  MATCHES
  , pacing of the event, and smooth flow of
  MATCH
  play.
  FIELD
  Supervisors are responsible for ensuring the
  FIELD
  is intact and lead
  FIELD
  Reset teams, who are responsible for resetting the
  FIELD
  after each
  MATCH
  in preparation for the subsequent
  MATCH
  . For additional details, please refer to the
  FIELD
  Supervisor role description.