Context-Aware Inland Waterway Guide Combining Navigation, Locks, Hydrology and Local History

Defensive Prior Art Disclosure

Context-Aware Inland Waterway Guide Combining Navigation, Locks, Hydrology and Local History

Statement of Intent

This document is published as a defensive prior art disclosure. The author makes the described system and methods publicly available so that the disclosed combinations may be considered prior art against later patent applications.

No exclusive patent rights are asserted by the author over the concepts expressly disclosed in this publication.

Technical Field

The disclosure relates to:

• inland-waterway navigation assistance;
• location-aware travel guides;
• lock, bridge and marina information;
• hydrological observations and forecasts;
• offline route-corridor data;
• context-dependent presentation of historical and tourist information.

Background and Technical Problem

Conventional chartplotters focus primarily on navigation geometry. Tourist applications focus on roads, walking routes and static points of interest. Hydrological portals provide water-level data but are not normally integrated with the current route and characteristics of a small vessel.

An inland-waterway user needs a different combination of information:

• distance and estimated time to the next lock;
• opening hours and operational notices;
• bridges, shallows and restrictions;
• nearby fuel, food, mooring and repair facilities;
• current and predicted water levels;
• historically or culturally significant places visible from the water.

Network coverage on rivers and lakes is not guaranteed, so the core guide should remain operational offline.

Summary of the Disclosed Solution

The disclosed system determines the vessel's current position and progress along a planned or inferred waterway route. It selects information objects within a route corridor, calculates their relevance and presents them before or while the vessel reaches the corresponding location.

Objects may represent navigational infrastructure, hydrological stations, services, hazards, tourist attractions or historical narratives.

System Components

An exemplary system comprises:

1. a GNSS position source;
2. a route or waterway graph;
3. a database of georeferenced information objects;
4. a route-corridor query engine;
5. a relevance and trigger engine;
6. a local cache;
7. a presentation interface;
8. optional network synchronization with external data services.

The system may run on an onboard computer, a smartphone, a fleet tracker with a companion application or a server combined with an offline client.

Waterway Route Representation

The route may be represented as:

• an ordered polyline;
• a graph of navigable segments;
• a sequence of waypoints;
• a selected river or canal section;
• a route inferred from recent movement and available waterway geometry.

Each segment may include attributes such as permitted direction, speed limit, nominal depth, width, kilometer marker and related infrastructure.

Information Objects

An information object may contain:

• geographic position or covered segment;
• object category;
• name and description;
• direction of relevance;
• distance from the navigable route;
• validity dates or opening hours;
• media references;
• source and update time;
• offline priority;
• optional trigger distance or trigger time.

Example categories include:

• lock;
• movable bridge;
• fixed bridge;
• weir or dam;
• marina or mooring place;
• fuel point;
• restaurant or shop accessible from the bank;
• repair service;
• rescue or emergency access point;
• museum, monument or historical site;
• natural feature;
• hydrological gauge;
• temporary restriction or warning.

Route-Corridor Selection

Rather than selecting all objects within a simple circle around the vessel, the system selects objects along the portion of the waterway located ahead of the vessel.

An exemplary query uses:

• the closest route segment;
• direction of travel;
• a forward route distance;
• a smaller backward distance;
• a lateral corridor width;
• object category and operating status.

This prevents an object on a nearby but disconnected river branch or road from being presented as if it were on the vessel's route.

Distance and Time to Infrastructure

Distance is measured along the waterway route rather than as a straight line. Estimated time may use:

• current speed over ground;
• recent average speed;
• speed limits;
• expected waiting or service time at locks;
• daylight or facility opening times;
• known current direction.

The system may present both distance and a time range when the estimate is uncertain.

Lock and Bridge Assistance

For an upcoming lock or movable bridge, the interface may show:

• route distance and estimated arrival time;
• contact channel or telephone number;
• operating hours;
• dimensions and restrictions;
• side or location of waiting area;
• recent notice or closure state;
• instructions cached for offline use.

A reminder may be generated early enough for the captain to contact the operator or prepare lines and fenders.

Hydrological Data Integration

The system associates route sections with one or more water-level or flow stations. It may store:

• current level;
• historical levels;
• forecast level;
• rate and direction of change;
• warning thresholds;
• acquisition time and source.

The interface presents the age of the data and avoids representing stale observations as current.

A simple route notification may be generated when a configured threshold is crossed or when the trend indicates that the threshold may be crossed before expected vessel arrival.

The threshold may be associated with a route segment, operator notice or user-defined vessel profile.

Tourist and Historical Narration

When a relevant attraction or historical location is ahead, the system may display or speak a short description. The trigger may depend on:

• along-route distance;
• vessel speed;
• direction of approach;
• whether the object is visible from the water;
• whether the same item has already been presented during the voyage;
• user-selected categories and language.

Longer content may be available on demand. This prevents the interface from distracting the captain with excessive text.

Offline Data Package

Before a voyage, the system may download a package for the selected route. The package can contain:

• route geometry;
• infrastructure records;
• operating instructions;
• selected charts or map tiles;
• hydrological station metadata and last observations;
• tourist descriptions and audio;
• emergency contact information.

Each element may have an expiry time. When connectivity returns, small dynamic records such as lock status or water level may be updated without downloading the full package again.

Fleet and Rental Variants

A rental operator may define a recommended route and publish a curated information package to customer phones or onboard devices.

The guide may notify the customer about:

• the latest safe turnaround point;
• approaching end of the permitted route;
• estimated return time;
• nearby authorized landing points;
• local rules and hazards.

The same infrastructure data can be shared by all craft in the fleet while individual devices maintain their own progress and presentation history.

Example Operating Sequence

1. The user selects a river route.
2. The device downloads or loads the route's offline package.
3. GNSS position is matched to the waterway segment.
4. The query engine selects relevant objects located ahead.
5. The next lock is shown with along-route distance, estimated arrival time and instructions.
6. A hydrological station associated with the following segment reports a falling trend; the interface shows the observation time and configured warning.
7. As the boat approaches a historic riverside structure, a short audio description is presented.
8. Loss of network access does not remove the cached route, infrastructure or guide content.

Technical Effects and Advantages

The system provides:

• reduced irrelevant information compared with radius-only POI search;
• correct distance along a water route;
• integrated operational, hydrological and tourist context;
• advance preparation for locks and bridges;
• continued operation outside mobile coverage;
• controlled, nonrepeating presentation appropriate to a moving vessel.

Technical Concepts Disclosed for Prior Art Purposes

This publication expressly discloses:

1. a location-aware inland-waterway guide combining navigation infrastructure, services, hydrology and historical content;
2. selection of information using a forward route corridor and direction of travel;
3. distance and arrival time calculated along a navigable waterway rather than in a straight line;
4. automatic pre-arrival presentation of lock and bridge instructions;
5. association of water-level observations and forecasts with specific route sections;
6. route-specific offline packages containing both operational and tourist data;
7. spoken or visual narration triggered by position, direction, speed and prior presentation state;
8. rental-fleet distribution of curated waterway information packages.

Public Availability Declaration

The concepts expressly described here are made available for public implementation, modification and extension. The publication is intended to establish public technical disclosure of these methods and combinations.