01
HUD VIEW · WHAT THE OPERATOR SEES◢◤ FD-HMD1/REV.B01What the operator sees.
Live HUD simulation. Select a scenario. The overlay reconfigures live across four mission profiles — friendlies, threats, waypoints, and vitals.
SCENARIO · OVERLAY MODE4 PROFILES
PATROL · situational sweep · low-signature
POWER · KEYSTONE BAY 03SHARED BUS
86%5.0V · 2.7A · DRAWING
SOURCE · FD-K25 / BAY-03 / 9.6AH PACK · ESTIMATED 60 MIN
TRACKED · 4SENSOR FUSION ACTIVE
02
SENSOR FUSION · WHAT FEEDS THE OVERLAY◢◤ FD-HMD1/REV.B01Nine inputs. One readout.
The processing unit fuses optic, thermal, illuminator, attitude, GPS, squad mesh, and the Keystone power-and-data bus into a single overlay. Latency under 16 ms end-to-end. Hover any input to trace its path.
03
ARCHITECTURE · MODULES◢◤ FD/REV.B01Three modules. One cable.
Three independently serviceable modules on a single USB-C bus. Power and data on one connection — deliberate departure from dual-bus designs that add weight and failure modes with marginal benefit at this form factor.
M-A
DISPLAY MODULE
M-A · OPTICAL OUTPUT
MASS82 G
CONNECTORUSB-C · POWERED
HOT-SWAP14 SEC · HOT
SERVICETOOL-FREE
Hot-swappable under power. Standard mounting geometry. Field-replaceable in 14 seconds — timed and verified at FD-LAB with 30 operators.
M-B
OPTICAL STACK
M-B · OPTICS
MASS68 G
CONNECTORINTERNAL · FIXED
HOT-SWAPBY DESIGN — NO SWAP
SERVICEVALIDATED · NO ADJ
Fixed geometry. Validated and documented — no measurable parallax at 3m. Adjustment points removed by design. What you see is the architecture.
M-C
PROCESSING UNIT
M-C · COMPUTE
MASS135 G
CONNECTORUSB-C · DATA + POWER
HOT-SWAPOFF-POWER
SERVICEM4/M3 HEX KEY
Off-the-shelf compute with a thin firmware layer. Interface published and version-controlled. Any firmware change that alters the interface increments the revision and ships a delta document.
BUS ARCHITECTURE · SINGLE CABLE · KEYSTONE 25 POWERED
4-CONNECTOR REDUCTION vs CONVENTIONAL · POWER + DATA ON ONE CABLE · NO SECONDARY HARNESS
04
FIELD RECORD◢◤ FD/REV.B01Verified and in service.
Verified claims against the current revision. Service and integration data. Firmware interface published as JSON-over-serial — chosen for legibility without specialised tooling; any change that alters the interface increments the revision.
▸ VERIFIED · 4 CLAIMS · B01
Optical axis geometry validated · no measurable parallax at 3m
Modular display module · field-swappable, 14 sec mean
USB-C power + data single-cable architecture
Documented firmware interface · JSON-over-serial protocol
▸ SERVICE · INTEGRATION
COMPATIBLE WITHKEYSTONE 25 A03 · BAY INT-PU / INT-BT →
FASTENER DISCIPLINEM4 + M3 STAINLESS · ONE HEX KEY
SPARES KITFIELD SPARES KIT IN PROGRESS
PANEL ACCESSMODULAR: RAIL, COMPUTE, BATTERY
REPLACEABILITYEVERY COMPONENT, FIELD-SERVICED
INTERFACE DEFINITIONUSB-C SPEC PUBLISHED
PLATFORM COMPATHELMET-AGNOSTIC RAIL
HARNESS VARIANTSBACKPACK / WAIST · TBD
LOAD POINTSHEAD ≤ 480 G · HARNESS RATED
FIRMWAREv0.4.1 · PUBLISHEDICD: JSON-OVER-SERIALVERSION-CONTROLLED · DELTA DOC ON INTERFACE CHANGEICD ON REQUEST →
05
REVISIONS◢◤ FD/REV.B01Revision history.
Every trade stamped. Active prototype revision.
B01
CURRENT · INITIAL ARCHITECTURE
Initial architecture. Single-cable USB-C confirmed. Optical geometry validated.
2025.09
▸ DELTAS
STATUSCURRENT · ACTIVE
DISPLAYHOT-SWAP · 14 SEC
CABLEUSB-C SINGLE · CONF.
OPTICSGEOMETRY VALIDATED
DELTAONGOING · SEE TARGETS
▸ FINDINGS · WHAT THIS REV LEARNED
›Display module hot-swap target met at 14 seconds. Weight and ambient light rejection targets remain open.
›Optical geometry validated · no measurable parallax at 3m.
›Single-cable USB-C architecture confirmed. No dual-bus requirement at this form factor.
Prior revisions documented in the lab notes.