EffeDoppiaVu
Precision digital tools for marine navigation, plus engineering builds and full-stack web projects — made to be used, not just looked at.
5
Tools liveTools live
5
FormatsCoordinate formats
4
ProjectsProjects shipped
Catalogue
Tools
Navigation and marine calculators first — then a private PDF editor that stays in the browser.
Flagship tool
Lat/Long Coordinate Converter
Convert and plot positions in DD, DDM, DMS, BNG, MGRS, and What3Words — then pick a point on the map or build a full route with GPX export.
Navigation & Marine
Passage-planning calculators for speed, clearance, and course to steer.
Speed Distance Time
Solve for speed, distance, or ETA from any two values.
Vertical Clearance
Air draft, tide height, and a safety margin for bridges and overheads.
Course to Steer
Compass course corrected for current, wind, and deviation.
Browser Utilities
Private, in-browser tools — nothing is uploaded.
Reference
Regulations
The collision regulations as a searchable desk reference — the rule you need, not a PDF to scroll.
IRPCS / COLREGs
All 41 rules and four annexes, cross-linked. Jump in by topic or search the wording.
Work
Projects
Mechanical builds in the workshop, and full-stack sites shipped for clients.
