US4091543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic magnetic compass correction
Assignee: Laitram LLC
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Filing: 1976-06-17
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Granted: 1978-05-30
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Expires: 1996-06-17
Abstract
Abstract Method and apparatus for providing automatic correction of deviation errors in a magnetic compass. Data representing deviation corrections for respective compass headings are stored in memory and in response to a digital signal from the magnetic compass representing an indicated heading, the corresponding correction is provided from memory to yield a output signal representing actual heading and corrected for deviation error.
Inventors
- 👤 James M. Lapeyre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:31
CPC Classifications
G; G01; G01C; G01C17/00; G01C17/38
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
Apparatus for providing a deviation-corrected output signal representative of an actual compass heading comprising: a magnetic compass providing a digital output signal representative of an indicated compass heading; means for storing deviation-corrected signals representative of the actual heading of the compass for each of a plurality of different indicated headings and for providing the stored deviation-corrected signal corresponding with the indicated compass heading in response to the output signal from the compass; and means responsive to the provided deviation-corrected signal for producing a deviation-corrected output signal representative of the actual compass heading.
Claim 2
Dependent Claim
92 words
Apparatus for providing a deviation-corrected output signal representative of an actual compass heading comprising: a magnetic compass providing a digital output signal representative of an indicated compass heading; means for storing deviation-corrected signals representative of the actual heading of the compass for each of a plurality of different indicated headings and for providing the stored deviation-corrected signal corresponding with the indicated compass heading in response to the output signal from the compass; and means responsive to the provided deviation-corrected signal for producing a deviation-corrected output signal representative of the actual compass heading.
Claim 3
Dependent Claim
94 words
Apparatus for providing a deviation-corrected output signal representative of an actual compass heading comprising: a magnetic compass providing a digital output signal representative of an indicated compass heading; a read-only memory for storing deviation-corrected signals representative of the actual heading of the compass for each of a plurality of different indicated headings and for providing the stored deviation-corrected signal corresponding with the indicated compass heading in response to the output signal from the compass; and means responsive to the provided deviation-corrected signal for producing a deviation-corrected output signal representative of the actual compass heading.
Claim 4
Dependent Claim
94 words
Apparatus for providing a deviation-corrected output signal representative of an actual compass heading comprising: a magnetic compass providing a digital output signal representative of an indicated compass heading; a read-only memory for storing deviation-corrected signals representative of the actual heading of the compass for each of a plurality of different indicated headings and for providing the stored deviation-corrected signal corresponding with the indicated compass heading in response to the output signal from the compass; and means responsive to the provided deviation-corrected signal for producing a deviation-corrected output signal representative of the actual compass heading.
Claim 5
Dependent Claim
95 words
Apparatus for providing a deviation-corrected output signal representative of an actual compass heading comprising: a magnetic compass providing an output signal representative of an indicated compass heading; means for storing deviation-correction signals representative of the deviation of the compass for each of a plurality of different indicated headings and for providing the stored deviation-correction signals corresponding with the indicated compass heading in response to the output signal from the compass; and means for combining the compass output signal and the provided deviation-correction signal to produce the deviation-corrected output signal representative of the actual compass heading.
Claim 6
Dependent Claim
95 words
Apparatus for providing a deviation-corrected output signal representative of an actual compass heading comprising: a magnetic compass providing an output signal representative of an indicated compass heading; means for storing deviation-correction signals representative of the deviation of the compass for each of a plurality of different indicated headings and for providing the stored deviation-correction signals corresponding with the indicated compass heading in response to the output signal from the compass; and means for combining the compass output signal and the provided deviation-correction signal to produce the deviation-corrected output signal representative of the actual compass heading.
Claim 7
Dependent Claim
29 words
The apparatus of claim 3 wherein the means for storing comprises a read-only memory containing data representative of compass deviation for each of a plurality of different compass headings.
Claim 8
Dependent Claim
60 words
The apparatus of claim 4 further comprising means for providing signals representative of magnetic variation; and wherein the producing means is further operative to combine the signals representative of magnetic variation with the compass output signal and the retrieved deviation-correction signal to produce a deviation-correction output signal representative of the actual heading of the compass with respect to true north.
Claim 9
Dependent Claim
22 words
The apparatus of claim 4 further including a digital readout responsive to the deviation-corrected output signal for display of actual compass heading.
Claim 10
Independent Claim
90 words
A method for providing deviation-correction signals for a magnetic compass, comprising the steps of: storing deviation-correction signals representative of the deviation of the compass for each of a plurality of different headings; providing a digital compass output signal from a compass representative of an indicated compass heading; retrieving in response to the output signal from the compass the stored deviation-correction signal corresponding to the indicated compass heading; and combining the compass output signal and the retrieved deviation-corrected signal to produce a deviation-corrected output signal representative of the actual compass heading.
Claim 11
Independent Claim
90 words
A method for providing deviation-correction signals for a magnetic compass, comprising the steps of: storing deviation-correction signals representative of the deviation of the compass for each of a plurality of different headings; providing a digital compass output signal from a compass representative of an indicated compass heading; retrieving in response to the output signal from the compass the stored deviation-correction signal corresponding to the indicated compass heading; and combining the compass output signal and the retrieved deviation-corrected signal to produce a deviation-corrected output signal representative of the actual compass heading.
Claim 12
Dependent Claim
60 words
The method of claim 7 further including the step of providing a signal representative of magnetic variation: and wherein the step of combining further includes combining the signal representative of magnetic variation with the compass output signal and the retrieved deviation-correction signal to produce an output signal representative of the actual heading of the compass with respect to true north.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |