Exhibit 5

                    [GEOTEK COMMUNICATIONS, INC. LETTERHEAD]

                                                     October 16, 1995 

Geotek Communications, Inc. 
20 Craig Road 
Montvale, New Jersey 07645 

Gentlemen: 

         I am general counsel to Geotek Communications, Inc., a Delaware
corporation (the "Company"), and have served in such capacity in connection with
the preparation of the Company's Registration Statement on Form S-3
(Registration No. 33-62327) which the Company filed with the Securities and
Exchange Commission (the "SEC") on September 1, 1995 under the Securities Act of
1933, as amended (the Registration Statement as amended at the time it became
effective being referred to herein as the "Registration Statement"). The
Registration Statement relates to the offer and sale of an aggregate of
$20,700,000 principal amount at maturity of the Company's 15% Series A Senior
Secured Discount Notes due 2005 (the "Offered Notes"). The Offered Notes were
issued under an Indenture dated as of June 30, 1995 between the Company and IBJ
Schroder Bank & Trust Company (the "Trustee"), as supplemented by that certain
Supplemental Indenture dated as of August 28, 1995 (collectively, the
"Indenture").

         I have examined, among other things, the Certificate of Incorporation
and the Bylaws of the Company, the Indenture and the form of Offered Note. I
also have examined originals or copies, certified or otherwise identified to my
satisfaction, of such corporate records of the Company and other instruments and
documents and statutory and other materials as I have deemed necessary as a
basis for the opinions hereinafter expressed.

         In rendering the opinion below, I have assumed, without any independent
investigation or verification of any kind: (i) the genuineness of all signatures
on, and the authenticity and completeness of, all documents submitted to me as
originals and the conformity to original documents and completeness of all
documents submitted to me as certified, conformed or photostatic copies; (ii)
that the Indenture has been duly authorized, executed and delivered by the
Trustee; and (iii) that the Offered Notes have been duly authenticated by the
Trustee.

         Based on and subject to the foregoing and subject to the
qualifications, limitations and exceptions contained below, I am of the opinion
that the Offered Notes have been duly authorized, executed and delivered by the
Company and are entitled to the benefits of the Indenture and are valid and
legally binding obligations of the Company, enforceable against the Company in
accordance with their terms, except (i) as limited by applicable bankruptcy,
insolvency, reorganization, receivership, moratorium, fraudulent transfer and
conveyance laws and other similar laws of general application now or thereafter
in effect relating to or affecting the rights and remedies of creditors
generally, (ii) as limited by general principles of equity, whether enforcement
is considered in a proceeding in equity or at law, and the discretion of the
court before which any proceeding therefor may be brought, (iii) the
enforceability under certain circumstance under law or court decisions of
provisions providing for the indemnification of or contribution to a party with
respect to a liability where such indemnification or contribution is contrary to
public policy, and (iv) I express no opinion concerning the enforceability of
the waiver of rights or defenses contained in Section 4.19 of the Indenture.

         The opinions expressed herein are limited to the laws of the State of
New York, the General Corporation Law of the State of Delaware and United States
Federal law. No opinion is expressed on any matters other than those expressly
referred herein. The opinions set forth herein are as of the date of this letter
and I do not render any opinion as to the effect of any matter which may occur
subsequent to the date hereof.

         I hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to me under "Legal Matters" in the
Prospectus forming a part of the Registration Statement. In giving such consent,
I do not admit hereby that I come within the category of persons whose consent
is required under Section 7 of the Securities Act of 1933, as amended, or the
rules and regulations of the SEC promulgated thereunder.

                                                     Very truly yours, 

                                                     /s/ Andrew Siegel 
                                                     --------------------------
                                                     Andrew Siegel 

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