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| Number | Title | Issue Date |
| 7003138 | System and method for geographically referencing an improvement image The instant invention is a system and method for converting improvement images to geographically referenced chart symbols and for combining improvement images with other geographically referenced information to create composite images. The instant invention provides... | 02/21/2006 |
| 5731573 | Tide calculator A pocket tide calculator is described which predicts tide times and moon phases in a visual display which gives the semi-diurnal tide times in any given day of the month and can be readily set for the following month. This device automatically leaves out ... | 03/24/1998 |
| 5167072 | Directional plotter for underwater searches A directional plotter for underwater searches, land searches, land orienting, or the like includes a pair of first and second relatively rotatable discs with the first disc including first, second and third concentric sets of compass degrees in radially a... | 12/01/1992 |
| 5137302 | Analog slide display A device for rapidly obtaining data related to destination points in the form of a navigational chart that supports a slide to move in a defined path relative to and beneath the display. A window is provided in the chart or along an edge thereof to enable... | 08/11/1992 |
| 4920033 | Rotatable disk teaching apparatus A demonstrative teaching apparatus for teaching the relationship between variable pictorial and/or graphic displays and their respective numerical values, in which the entire apparatus is positioned within an apparatus housing. The apparatus housing incor... | 04/24/1990 |
| 4886458 | Mechanical analog computer device This invention provides an inexpensive but accurate mechanical analog computer device for providing information based on the relative positions of two or more indicia bearing members at least one of which is mounted to another of said members for non-rota... | 12/12/1989 |
| 4855577 | Navigational and yacht racing calculator A navigational calculator (10) for establishing the ratios of time, or distance, to be spent on port or starboard tacks, respectively, during the maneuvering of a yacht to a windward destination. A plurality of disk members are carried on a central suppor... | 08/08/1989 |
| 4689476 | Mariner's dogleg course distance calculator There is disclosed a marine calculator of the slide rule type whereby the running distance to a destination station over a dogleg or zig zag course may be readily determined from knowledge of the rhumb line course distance and the departure angle of the d... | 08/25/1987 |
| 4652728 | Wind and course calculator for navigation A wind and course calculator for navigation is provided comprising two superimposed disks made from a transparent material, a mobile disk 1 movable in rotation and in translation carrying a network of concentric circles corresponding to the speeds and of ... | 03/24/1987 |
| 4491724 | Course and heading computer A course and heading computer for use with marine charts which includes a transparent planar baseplate having a semicircular edge at one end joined with rectangular edges at the opposite end, the straightedge parallel to the shorter dimension of the basep... | 01/01/1985 |
| 4456821 | Time/speed/distance slide rule A slide rule for solving time/speed/distance problems where distances are measured with a single or universal ruler applicable to all charts or maps regardless of scale. Result is achieved by printing alongside time entries on the slide rule a row of appr... | 06/26/1984 |
| 4446361 | Aircraft flight computer The purpose of this invention is to provide an improved structure for a flight computer used by aircraft pilots. This improved computer structure is constructed of sheets of material fastened together in laminer fashion the outer surfaces containing formu... | 05/01/1984 |
| 4359629 | Tactical indicator for bulkhead and other compasses Yacht racing is becoming more scientific and to assist a skipper in quantifying the shortest course to sail to take advantage of wind direction, a tactical aid is provided. The aid is a device for use in connection with information read from a compass mou... | 11/16/1982 |
| 4346288 | Fuel saving aircraft descent calculator A manually operable calculator for optimizing aircraft fuel consumption during descent from an actual altitude to a target altitude/distance. Altitude and distance scales are provided which are alignable to determine an uncorrected fuel efficient distance... | 08/24/1982 |
| 4272107 | Tide time indicator A tidal time indicator for determining tide times at various locations on a specific stretch of coastline comprises a pair of complementary charts. One of the charts is in the form of a map having index marks representing the various locations and which m... | 06/09/1981 |
| 4251721 | Pattern and threshold speed calculator A circular disk type calculator for determining the proper approach speed for a particular aircraft within a specified range of gross weights and flap settings. The calculator includes three superposed circular disks pivoted for independent rotation about... | 02/17/1981 |
| 4176860 | Street address locating aid A street address locating aid includes two printed paper discs. Street addresses and cross streets are printed in concentric circles on both sides of each disc. A printed paper carrier having first and second essentially parallel sheets is mounted on oppo... | 12/04/1979 |
| 4134006 | Navigational wind effect computer for aircraft A device utilizing three discs, which are rotatably positionable relative to each other, is provided for computing aerial navigation wind correction angle and ground speed correction for various combinations of aircraft True Course, Wind Direction, Wind V... | 01/09/1979 |
| 4035617 | Tide and time calculating device A time and tide calculating device for wrist watches clocks and calculators that register the tides and the time of the tides, comprising rotatable concentric tide and calendar discs placed adjacent to a clock face for indicative registration and cooperat... | 07/12/1977 |
| 4011987 | Aircraft descent profile calculator An aircraft descent calculator including a central member defining an outer annular dial face about the periphery thereof; an intermediate member defining an intermediate annular dial face about the periphery thereof rotatably mounted on the central membe... | 03/15/1977 |
| 3982104 | Tide and time calculating device A time and tide calculating device for wrist watches clocks and calculators that register the tides and the time of the tides, comprising rotatable concentric tide and calendar discs placed adjacent to a clock face for indicative registration and cooperat... | 09/21/1976 |
| 3957199 | Navigational aids A course correction calculator for use in light aircraft includes two arms pivotally connected together and each independently pivoted over a map supported on a base. The pivot connecting the two arms is slidable longitudinally along one of the arms and t... | 05/18/1976 |
