초록 ▼

An electronic chart system in which charts of the earth are stored in digital representation and communicated to the operator by a visual display. Through the use of a Loran-C receiver or the like, the system additionally plots the carrier\s position on the visual representation of the chart. The vi

An electronic chart system in which charts of the earth are stored in digital representation and communicated to the operator by a visual display. Through the use of a Loran-C receiver or the like, the system additionally plots the carrier\s position on the visual representation of the chart. The visual display is a cathode ray tube on which the visual representation is compressed or expanded to meet the demands of the operator so that the appropriate resolution is thereby obtained. To minimize memory size an encoding format is used which provides a data word for indicating the first physical element of the run line, a data word for the number of runs per line and data words for the lengths of N-1 runs of up to two variables for each line of the chart.

대표청구항 ▼

A chart display system comprising: (a) a display means for receiving run information for a preselected number of row and column scan lines for display; (b) an attachable memory means containing a digital representation of a plurality of physical elements of a chart, said digital representation inclu

A chart display system comprising: (a) a display means for receiving run information for a preselected number of row and column scan lines for display; (b) an attachable memory means containing a digital representation of a plurality of physical elements of a chart, said digital representation including for each scan line a plurality of binary coded words including a word for selectively indicating one of the said plurality of physical elements, a word for indicating the number of runs in said scan line, a plurality of words for indicating, for all but the last run, the length of the runs for the physical elements, each one of said plurality of words for indicating the length of the runs is of variable length having an indicator bit for selectively indicating a first or a second predetermined number of bits as a run length, and (c) a control means operatively connected to the attachable memory means and display means, respectively, for receiving the run information thereof and converting the run information to electrical representations for display.