date: '2026-10-19' status: design_input_contract_not_implemented_or_hardware_validated reference: docs/41_open_boat_projects_review.md motor_nominal_V: 72 max_hull_skin_draft_m: 0.53 SignalK_schema_snapshot_version: 1.8.4 required_record_fields: - value - unit - source - measurement_time_UTC - reception_monotonic_time - quality - calibration_id - device_revision - firmware_commit - frame_and_position - stale_or_fault_state freshness: max_age_by_channel_s: null maximum_clock_error_s: null repeated_value_does_not_renew_measurement_time: true replay_data_must_be_marked_and_not_command_live_actuators: true gateway: telemetry_only_by_default_design: true actuation_requires_separate_authority_and_guard_contract: true physical_interfaces_voltage_isolation_and_pinout: null required_PGN_sentence_conversion_table: null source_priority_and_loop_prevention: null MQTT_topic_alone_is_not_SignalK_delta: true traction_CAN_and_instrument_network_not_assumed_same_bus: true power: auxiliary_bus_voltage_V: null DC_DC_upper_input_V: null DC_DC_nominal_and_peak_W: null separate_emergency_control_power: null do_not_feed_low_voltage_modules_directly_from_72V: true channels: - id: wind signalK_path: environment.wind.speedApparent unit: m/s source_ids: - OBP03 - OBP15 - OBP16 role: nav_and_slow_energy_kite_coordination constraint: not_fast_kite_feedback physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: wind_angle signalK_path: environment.wind.angleApparent unit: rad source_ids: - OBP15 role: nav_and_slow_coordination constraint: negative_to_port physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: heading signalK_path: navigation.headingMagnetic unit: rad source_ids: - OBP11 - OBP24 role: navigation_and_rudder constraint: calibrate_under_actual_motor_and_winch_currents physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: position signalK_path: navigation.position unit: lat_lon_deg source_ids: - OBP04 - OBP24 role: navigation_and_anchor_watch constraint: separate_position_from_COG_and_heading physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: attitude signalK_path: navigation.attitude unit: rad source_ids: - OBP24 role: frame_transformations constraint: define_sensor_to_boat_and_calculation_frames physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: shaft_speed signalK_path: propulsion..revolutions unit: Hz source_ids: - OBP17 - OBP34 role: propulsion_diagnostics constraint: mechanical_rev_per_second_not_ERPM physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: battery_current signalK_path: electrical.batteries..current unit: A source_ids: - OBP31 - OBP32 role: energy_balance constraint: positive_charging_in_SignalK_battery_schema physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: battery_SOC signalK_path: electrical.batteries..capacity.stateOfCharge unit: ratio source_ids: - OBP32 role: energy_reserve constraint: 0_to_1_not_percent physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: temperature signalK_path: per_selected_schema unit: K source_ids: - OBP09 - OBP17 role: cooling_and_energy constraint: physical_probe_and_medium_compatibility_pending physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: coolant_flow signalK_path: null unit: m3/s source_ids: - OBP17 role: cooling_diagnostics constraint: path_and_sensor_to_select physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: tank_volume signalK_path: null unit: m3 source_ids: - OBP12 - OBP13 role: water_and_loading constraint: calibrated_tank_geometry_heel_trim_sloshing physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: bilge_alarm signalK_path: null unit: boolean source_ids: - OBP09 - OBPU01 role: monitoring_and_alarm constraint: local_alarm_independent_of_WiFi physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: AIS signalK_path: null unit: per_message_schema source_ids: - OBP29 role: situational_awareness constraint: onboard_receiver_distinct_from_internet_AIS physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null - id: anchor_watch signalK_path: null unit: per_schema source_ids: - OBP21 role: anchoring constraint: separate_GNSS_and_power_failure_alarm physical_count: null installed_mass_kg: null average_power_W: null peak_power_W: null measurement_range: null update_period_s: null timeout_s: null wind: no_mast_sensor_location: null distortion_due_roof_PV_kite: null velocity_frame_and_ground_water_reference_required: true sensor_reading_not_equal_wind_at_kite: true mass_accounting: replace identified electronics allowance; include cables enclosures power modules cooling backup and mounts without duplicate full allowance independent_fast_controllers: - kite - inverter_current_loops - BMS_protection - rudder_actuator_local_limits