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SITL Phase 6: BlueBoat waypoint mission with Ardu guidance - #82

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@bsb808 bsb808 commented Oct 16, 2026 •

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Phase 6 of docs/specs/SITL_SPEC.md. The spec lays out the intent.

The BlueBoat flies one small waypoint mission unattended in AUTO mode and walkthrough documentation for step-by-step user instructions.

What's in it

  • blueboat_gazebo/missions/lawnmower.waypoints: 10 m legs east/west, 5 m steps north, a diagonal home. .
  • test_mission_file.py: static checks on the installed file (format, pinned home, on the water, waypoints distinct).
  • blueboat_sitl.params: the shipped waypoint-navigation block (WP_PIVOT_*, WP_ACCEL, WP_JERK, MIS_DONE_BEHAVE, PSC_*), verbatim from BlueBoat120.params. Without WP_PIVOT_ANGLE the firmware disables pivot turns. This is important because we want to be using the hardware parameters in SITL
  • Walkthrough: docs/vehicles/blueboat/mission-sitl-boat.md, with figures from the scripted runs.
  • Spec: phase 6 narrowed; failsafes and a headless mission test deferred (no MAVLink client in the workspace, as in phase 4).

Review Request

Please go through the walkthrough - bluerobotics_models/docs/vehicles/blueboat/mission-sitl-boat.md.

The walkthrough attempts to be step-by-step and reproducible. Step through it manually (not with AI) and check that the steps are clear and understandable by a human. The point is to verify that the SITL control and guidance, using the Blue Boat hardware params, performs similarly for the simulated vessel. This implicitly verifies the physics (dynamics, hydro, etc.) This does so without environmental disturbances (wind and waves) as a baseline.

One fixed lawnmower mission (10 m legs, 5 m steps) installed with
blueboat_gazebo, a static test on the file, and a walkthrough that flies it
in AUTO against figures stated beforehand. SITL runs in lockstep, so the
figures are exact rather than tolerances.

The parameter file gains the shipped waypoint navigation block (WP_PIVOT_*,
WP_ACCEL, WP_JERK, MIS_DONE_BEHAVE, PSC_*). Without WP_PIVOT_ANGLE the
firmware default disables pivot turns and the boat arcs through corners.

Finding, recorded in the walkthrough and the spec: pivots drift forward,
because a steering-only command leaves a net surge force on this model
(published thrust ratio 2.0 vs MOT_THST_ASYM 1.6).

Spec: phase 6 cut to the minimum; failsafes and a headless mission test
deferred.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@bsb808 bsb808 changed the title SITL phase 6: BlueBoat waypoint mission (minimum viable) SITL Phase 6: BlueBoat waypoint mission with Ardu guidance Oct 18, 2026
@bsb808
bsb808 marked this pull request as ready for review October 18, 2026 22:26
@bsb808
bsb808 requested a review from j-rivero October 18, 2026 22:27

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