<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-05-04</periodOfReport>

    <issuer>
        <issuerCik>0000730255</issuerCik>
        <issuerName>CalAmp Corp.</issuerName>
        <issuerTradingSymbol>CAMP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001220898</rptOwnerCik>
            <rptOwnerName>HUTCHINS PATRICK</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CALAMP CORP.</rptOwnerStreet1>
            <rptOwnerStreet2>1401 N. RICE AVENUE</rptOwnerStreet2>
            <rptOwnerCity>OXNARD</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>93030</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President, Products Division</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.69</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2005-05-04</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>60000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2006-05-04</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2015-05-04</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>60000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>60000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Stock option becomes exercisable at 25% annually beginning on the date indicated in the &quot;Date Exercisable&quot; column.</footnote>
        <footnote id="F2">This is an employee stock option grant and therefore has no purchase price.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Patrick Hutchins by Richard K. Vitelle, Attorney-in-Fact</signatureName>
        <signatureDate>2005-05-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0202
4
2005-05-04
0000730255
CalAmp Corp.
CAMP
0001220898
HUTCHINS PATRICK
C/O CALAMP CORP.
1401 N. RICE AVENUE
OXNARD
CA
93030
0
1
0
0
President, Products Division
Employee Stock Option
5.69
2005-05-04
4
A
0
60000
A
2006-05-04
2015-05-04
Common Stock
60000
60000
D
Stock option becomes exercisable at 25% annually beginning on the date indicated in the "Date Exercisable" column.
This is an employee stock option grant and therefore has no purchase price.
Patrick Hutchins by Richard K. Vitelle, Attorney-in-Fact
2005-05-06