# US 11,112,955 B2 · Nautical chart display device, nautical chart display method, and nautical chart display program

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- Number: US 11,112,955 B2
- Document ID: US11112955B2
- Status: Granted
- Kind: B2
- Application number: 16/867,712
- Filed: 2020-05-06
- Published: 2020-08-20
- Granted: 2021-09-07
- Earliest claimed: 2017-11-10
- Assignees: Furuno Electric Co., Ltd.
- Applicants: Furuno Electric Co., Ltd.
- Inventors: Kentaroh Hamamoto; Takatoshi Morita; Masato Okuda; Takashi Ohmori
- Web page: https://patentgrep.com/patent/US11112955B2

## CPC

- G01C 21/203: {specially adapted for water-borne vessels}
- G06F 3/0481: based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
- G06F 3/04812: Interaction techniques based on cursor appearance or behaviour, e.g. being affected by the presence of displayed objects
- G06F 3/0484: for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
- G06F 3/04842: Selection of displayed objects or displayed text elements (G06F3/0482 takes precedence)
- G06F 3/04845: for image manipulation, e.g. dragging, rotation, expansion or change of colour
- G06F 3/0488: using a touch-screen or digitiser, e.g. input of commands through traced gestures
- G06T 11/26: Drawing of charts or graphs
- G06T 11/65: on geographic maps
- G09B 29/007: {using computer methods}
- G06F 2203/04806: Zoom, i.e. interaction techniques or interactors for controlling the zooming operation
- G06F 2203/04808: Several contacts: gestures triggering a specific function, e.g. scrolling, zooming, right-click, when the user establishes several contacts with the surface simultaneously; e.g. using several fingers or a combination of fingers and pen
- G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G09B: EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS (devices for psychotechnics or for testing reaction times A61B5/16; games, sports, amusements A63; projectors, projector screens G03B)

## Abstract

The purpose is to provide a nautical chart display device which enables to easily grasp a direction centering on a reference position. The nautical chart display device includes a display, a detector, a directional symbol displaying module, and a directional symbol changing module. The display displays a nautical chart on a screen. The detector detects an operation to the screen. The directional symbol displaying module displays, on the display so as to be superimposed on the nautical chart, a directional symbol in which directional markers arranged in a circle and the center of the circle are indicated. The directional symbol changing module moves the directional symbol according to an operation to the directional symbol.

## Claims

### Claim 1

A nautical chart display device, comprising:
a display configured to display a nautical chart on a screen;
a detector configured to detect an operation to the screen; and
processing circuitry configured
to display, on the display so as to be superimposed on the nautical chart, a directional symbol in which directional markers arranged in a circle and the center of the circle are indicated; and
to move the directional symbol according to an operation to the directional symbol, wherein
the processing circuitry increases or decreases in size of the directional symbol according to the operation to the directional symbol,
the directional symbol includes a distance scale line extending from the center of the circle,
a numerical value indicating a distance is illustrated on the distance scale line, and
the processing circuitry changes the numerical value of the distance scale line indicating the distance according to a scale of the nautical chart or the increase or the decrease in size of the directional symbol.

### Claim 2 (depends on 1)

The nautical chart display device of claim 1, wherein the processing circuitry rotates the nautical chart along with the directional symbol centering on the center of the directional symbol as a rotational center according to the operation to the directional symbol.

### Claim 3 (depends on 2)

The nautical chart display device of claim 2,
wherein the processing circuitry rotates the distance scale line centering on the center of the circle as a rotational center.

### Claim 4 (depends on 2)

The nautical chart display device of claim 2, wherein the directional symbol includes a drawing area in which characters or figures including at least the directional markers are displayed, and a non-drawing area in which the characters or the figures are not displayed, and at least in a part of the non-drawing area, the nautical chart is displayed.

### Claim 5 (depends on 1)

The nautical chart display device of claim 1,
wherein the processing circuitry rotates the distance scale line centering on the center of the circle as a rotational center.

### Claim 6 (depends on 1)

The nautical chart display device of claim 1, wherein the directional symbol includes a drawing area in which characters or figures including at least the directional markers are displayed, and a non-drawing area in which the characters or the figures are not displayed, and at least in a part of the non-drawing area, the nautical chart is displayed.

### Claim 7 (depends on 1)

The nautical chart display device of claim 1, wherein the processing circuitry displays the directional symbol including auxiliary lines extending radially from the center of the circle in given directions or in specified directions from the detector.

### Claim 8 (depends on 1)

The nautical chart display device of claim 1, the processing circuitry is further configured to register a point according to an inputted instruction from the detector,
wherein when the processing circuitry moves the directional symbol according to the operation, and the inputted instruction is given to move the directional symbol to the vicinity of the registered point, processing circuitry matches the registered point with the center of the directional symbol.

### Claim 9 (depends on 1)

The nautical chart display device of claim 1, wherein the processing circuitry displays the directional symbol including both of true directional markers indicating true directions, and magnetic directional markers indicating magnetic directions according to a geographic position.

### Claim 10

A method of displaying a nautical chart, comprising the steps of:
displaying, on a display so as to be superimposed on a nautical chart, a directional symbol in which directional markers arranged in a circle and the center of the circle are indicated, the directional symbol including a distance scale line extending from the center of the circle, a numerical value indicating a distance being illustrated on the distance scale line;
detecting an operation to the directional symbol on a screen of the display, and moving the directional symbol according to the operation;
increasing or decreasing in size the directional symbol according to the operation to the directional symbol; and
changing the numerical value of the distance scale line indicating the distance according to a scale of the nautical chart or the increasing or the decreasing in size of the directional symbol.

### Claim 11

A non-transitory computer-readable recording medium storing a control program causing a processor of a nautical chart display device to execute processing, the processor configured to control operation of the device, the processing comprising:
displaying, on a display so as to be superimposed on a nautical chart, a directional symbol in which directional markers arranged in a circle and the center of the circle are indicated, the directional symbol including a distance scale line extending from the center of the circle, a numerical value indicating a distance being illustrated on the distance scale line;
detecting an operation to the directional symbol on a screen of the display, and moving the directional symbol according to the operation;
increasing or decreasing in size the directional symbol according to the operation to the directional symbol; and
changing the numerical value of the distance scale line indicating the distance according to a scale of the nautical chart or the increasing or the decreasing in size of the directional symbol.