TERMS AND CONDITIONS OF SALE
                BETWEEN IMAGE GUIDED TECHNOLOGIES, INC. AND CARL ZEISS


         Carl Zeiss, D-73446, Oberkochen, Germany ("CZO"), and Image Guided
Technologies, Inc., 5710 B Flatiron Parkway, Boulder, CO 80301, USA ("IGT"),
agree to the following terms and conditions:

1.  TERM.

The term of this agreement shall be from February 20, 1997 through February 19,
1999.  This Agreement may be terminated at any time by either party by giving at
least 180 days prior written notice of termination to the other.

2.  PRICES; DISCOUNT; TAXES; PAYMENT.

The prices CZO shall pay to IGT for systems and other products provided by IGT
are IGT's list prices (current list prices are listed on Schedule D) at the time
CZO places an order, less any applicable discount as set forth on the attached
Schedule C.  Such discount structure is based upon IGT's receipt of a blanket
purchase order from CZO for IGT systems to be shipped over the twelve months
following the date of this agreement  The discounts from list price for IGT
products other than systems shall reflect the discount indicated on Schedule C
for the number of systems ordered year to date.  Services, such as maintenance
agreements, provided by IGT are not discounted.

If CZO requests delay in delivery or cancellation of any units (other than by
reason of the commencement of a patent infringement action as discussed below)
and IGT agrees to such request, the price of delivered units is subject to
recalculation in accordance with Schedule C.  It is understood that CZO shall
have no obligation to accept delivery of any undelivered units, or to refund any
"unearned" discount, in the event of the commencement of any action claiming
infringement of any third-party patent as a result of the marketing or sale of
IGT's products, and/or their use, by CZO or any of its customers, whether such
action alleges infringement by reason of the sale or use of IGT's manufactured
products alone or in conjunction with other equipment manufactured by CZO.  It
is further understood that, in the event of delivery arrears by IGT on any
purchase order accepted by IGT in excess of thirty (30) days, CZO shall have the
option to immediately cancel this Agreement.  CZO and IGT may mutually amend the
terms of this paragraph 2. in writing at any time.

CZO shall pay all sales, use, value added and similar taxes or duties assessed
by any governmental entity upon IGT products shipped by IGT or with respect to
payments made hereunder.

Shipment shall be F.O.B. IGT's plant in Boulder, Colorado and title and risk of
loss or damage shall pass to CZO at such F.O.B. point.

CZO agrees to provide IGT with monthly non-binding 90 day rolling forecasts of
items expected to be purchased during that 90 day period.




3.  SOFTWARE LICENSE.  The software included with an IGT localizer system is
licensed to CZO on the terms and conditions set forth on Schedule A, to which
CZO hereby agrees.

4.  WARRANTY.  IGT's warranty is set forth on Schedule B.  THIS WARRANTY IS 
IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THOSE OF 
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

5.  PATENT AND COPYRIGHT INDEMNIFICATION.

(a)  IGT shall defend any suit or proceeding brought against CZO to the
extent it is based on a claim that the IGT manufactured product directly
infringes a patent or copyright issued by the United States; provided IGT is
notified promptly in writing and given authority, information and assistance (at
IGT's expense) for the defense of the suit or proceeding.  IGT shall pay all
damages and costs awarded against CZO in such suit or proceeding or settlement,
if IGT has been given full control of the defense and the negotiations for
settlement, if any, of the suit or proceeding (any settlement shall require the
consent of CZO which shall not be unreasonably withheld).  If any IGT
manufactured product is held in such suit or proceeding directly to infringe a
patent or copyright of the United States, or is, in IGT's opinion, likely to be
held directly to infringe such a patent or copyright, IGT may, at its option and
expense, in the following order (a) procure for CZO the right to continue using
said product, (b) replace the product with non-infringing product, (c) modify
the product so that it becomes a non-infringing product, or (d) require return
of the product and refund the purchase price for the product (less a deduction
for depreciation equal to one and two-thirds percent (1.67%) of the purchase
price for each full month since the date of shipment of the product).  IGT shall
have no liability to CZO if the infringement or claim thereof is based upon (a)
the use of the product in combination with other products, devices or software
which are not furnished to CZO by IGT, (b) modification of the product by other
than IGT or (c) use of the product as part of any infringing process, apparatus
or product.  THIS SECTION STATES THE ENTIRE LIABILITY OF IGT FOR PATENT OR
COPYRIGHT INFRINGEMENT.

(b)  CZO shall indemnify IGT and defend any suit or proceeding brought
against IGT to the extent it is based on a claim that the making or selling of
CZO's product infringes a patent or copyright; provided that CZO is notified
promptly in writing and given authority, information and assistance (at CZO's
expense) for the defense of the suit or proceeding.  CZO shall pay all damages
and costs awarded against IGT in such suit or proceeding or settlement, if CZO
has been given full control of the defense and of the negotiations for the
settlement, if any, of the suit or proceeding (any settlement shall require the
consent of IGT which shall not be unreasonably withheld).
         
6.  MISCELLANEOUS.  This Agreement shall be governed by and construed in 
accordance with the laws of the State of Colorado, USA.

    CARL ZEISS                        IMAGE GUIDED TECHNOLOGIES, INC.


By: /s/                               By: /s/ Robert E. Silligman
   ---------------------------           ------------------------------
                                         President/ COO



                                      -2-




                                                                 EXHIBIT 10.20


The brackets ("[  ]") which appear in various places in the following exhibit
indicate areas where confidential information has been redacted by the Company. 
Such redacted information is the subject of a request for confidential treatment
and is therefore being filed separately with the Commission. 




                                      SCHEDULE A

                                   SOFTWARE LICENSE
                                         FROM
                           IMAGE GUIDED TECHNOLOGIES, INC.
                                          TO
                                      CARL ZEISS


    The software ("Software") included with each localizer system ("IGT 
System") being sold by Image Guided Technologies, Inc. ("IGT") to Carl Zeiss 
("CZO") is licensed to CZO upon the following terms and conditions:

         1.   LICENSE.  IGT hereby grants to CZO a non-exclusive, personal 
and non-transferable license to use the Software solely for CZO's own use and 
solely with the IGT System.  CZO may not sell, sublicense, transfer or 
otherwise make available to others all or any part of the Software, except 
for the right to grant sublicenses to its customers as specifically provided 
herein.  CZO shall not reverse engineer, reverse compile or reverse assemble 
the Software in whole or in part.

         2.   OWNERSHIP.  IGT owns all rights, title and interest in and to 
the Software, including, without limitation, patents, copyrights, trade 
secrets, and know-how.  Except for the purpose of incorporating the Software 
into CZO's own product, CZO shall not modify or revise the Software in whole 
or in part.

         3.   COPIES.  CZO may make copies of the Software for archival 
purposes only.  All copies of the Software (including permissible 
modifications and revisions hereunder) and IGT's documentation are the sole 
property of IGT and shall contain IGT's copyright notices.  CZO shall not 
remove or modify any copyright notices encoded on the Software or displayed 
on any documentation.

         4.   SUBLICENSE TO CUSTOMERS.  Before delivery to any of its 
customers of any product which includes the IGT System (or the software 
included therein), CZO shall take adequate steps to ensure that the customer 
only receives a customary sublicense which shall include provisions that 
provide (i) the Software remains the property of IGT, (ii) the customer only 
receives a personal, nonexclusive, nontransferable sublicense to use the 
Software for customer's own use with the IGT System, (iii) the Software may 
not be copied, modified, reverse engineered or dissembled in whole or in part 
by customer, (iv) the customer may not sell, sublicense, transfer or 
otherwise make available the Software to any third party, and (v) the 
sublicense shall expire when the customer discontinues use of the Software or 
the IGT System and upon expiration all Software media and materials shall be 
returned to CZO by customer.  Any such sublicense shall survive expiration of 
the license granted to CZO hereby.

         5.   CUSTOMER SERVICE AND SUPPORT; UPGRADES.  CZO shall be solely
responsible for all installation, use, support and support questions of its
customers.  IGT shall provide upgrades and enhancements to the Software to CZO
at no cost during the warranty period; upgrades and enhancements to the Software
after the warranty period shall be provided to 



CZO at IGT's standard discounted license fee.  The term "Software" as used in 
this license includes all upgrades and enhancements provided hereunder.

         6.   CONFIDENTIALITY.  The Software contains trade secrets, know-how 
and other proprietary information belonging to IGT.  CZO shall keep all such 
information confidential, shall not publish or disclose such information to 
others, and shall handle, maintain, and protect all such information with at 
least the same degree of care used by CZO to protect and safeguard its own 
trade secrets, know-how and proprietary information.

         7.   COPYRIGHT.  The Software and its related documentation are 
copyrighted.  IGT retains the sole and exclusive right, but not the 
obligation, to utilize legal and judicial proceedings to protect and enforce 
its copyright, trade secret and other proprietary rights.  CZO shall 
cooperate with IGT in any proceeding brought by IGT against any third party 
in connection with the foregoing (including, without limitation, on IGT's 
request assigning any rights under its sublicense with its customer).

         8.   EXPIRATION.  The license herein granted shall expire in the 
event that CZO fails to comply with any term or condition of this license or 
in the event that CZO permanently discontinues the sale of the IGT System on 
which the Software is licensed for use, whereupon CZO shall, promptly upon 
IGT's request, return to IGT all Software and related documentation in its 
possession (except for one archive copy), provided, however, that this 
provision shall not affect the continuing validity of any sublicense granted 
with respect to the Software by CZO to any of its customers pursuant to 
paragraph 4 above.

         9.   CZO COMPLIANCE.  This license is subject to all laws, 
regulations, orders and other restrictions on the export from the United 
States of computer software which may be imposed from time to time by the 
government of the United States.  CZO shall not export or transfer the 
Software to any country for which the United States government or any agency 
thereof requires an export license or other governmental approval without 
first obtaining (i) the consent of IGT, and (ii) such license or approval.

         10.  WARRANTY.  IGT warrants the Software as set forth on the 
warranty enclosed herewith.  THIS WARRANTY IS IN LIEU OF ALL OTHER 
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THOSE OF MERCHANTABILITY OR FITNESS 
FOR A PARTICULAR PURPOSE.

         11.  ESCROW.  IGT agrees to enter into a customary escrow 
arrangement for its source code and source code documentation.  The escrow 
agent shall be chosen by IGT and the escrow agent fee split between IGT and 
CZO.

                                         -2-



         12.  MISCELLANEOUS.  The validity and performance of this license 
shall be governed by Colorado law, except as to copyright matters which are 
governed by United States laws and international treaties.  This license is 
deemed entered into in Boulder, Colorado.  CZO may not assign this license or 
any of its rights or obligations hereunder.  This license shall inure to the 
benefit, and be binding upon, IGT and its successors and assigns.

    Should you have any questions concerning this license, please contact in 
writing:  Image Guided Technologies, Inc., Customer Sales and Service, 5710-B 
Flatiron Parkway, Boulder, CO 80301.

                                         -3-

                                   SCHEDULE B

                                 ZEISS WARRANTY
  For purchases made under the terms of the Agreement between Carl Zeiss and 
            Image Guided Technologies, Inc. Dated February 20, 1997

         1.   IGT'S PRODUCT WARRANTY.  Image Guided Technologies, Inc. 
("IGT") warrants that the IGT product will be free from defects in materials, 
parts and workmanship for a period of two (2) years from date of delivery to 
Carl Zeiss ("CZO"), and conform to IGT's specifications applicable to such 
IGT product (at the time of CZO's purchase thereof).  IGT DOES NOT WARRANT 
THE ACCURACY OF ANY SYSTEM UNLESS LIGHT EMMITING DIODES ("LEDS") INSPECTED 
AND APPROVED BY IGT ARE USED IN ALL COMPONENTS REQUIRING LEDS IN THE SYSTEM.  
NOTWITHSTANDING THE FOREGOING, IGT MAKES NO WARRANTIES AS TO ACCESSORIES 
MANUFACTURED BY THIRD PARTIES OR DISPOSABLE OR STERILIZABLE ITEMS, SUCH ITEMS 
BEING SOLD "AS IS." THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS 
OR IMPLIED, INCLUDING THOSE OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR 
PURPOSE.

         2.   WARRANTY REPAIR; MISUSE.  IGT's sole obligation under the 
foregoing warranty shall be to repair or replace, at IGT's option, at IGT's 
plant, without charge, defective IGT products returned for inspection within 
the applicable warranty period, and which have been determined by IGT to be 
defective.  Transportation charges for shipment from IGT's plant after the 
repair or replacement of the defective IGT product shall be paid for by CZO. 
IGT shall not be responsible for any modifications or changes to the IGT 
product (and CZO shall pay IGT for any services necessitated by any such 
modifications or changes) nor shall IGT be liable for any defects arising out 
of misuse, neglect, failure of electric power, cause other than ordinary use 
or other causes beyond IGT's control.

         3.   LIMITATION OF IGT LIABILITY.  IN NO EVENT SHALL IGT'S LIABILITY 
INCLUDE ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR CLAIMS 
FOR LOSS OF BUSINESS OR PROFITS, EVEN IF IGT SHALL HAVE BEEN ADVISED OF THE 
POSSIBILITY OF SUCH POTENTIAL LOSS OR DAMAGE. NOTWITHSTANDING ANY FAILURE OF 
THE CENTRAL PURPOSE OF ANY LIMITED REMEDY, IGT'S LIABILITY FOR BREACH OF 
WARRANTY SHALL NOT EXCEED THE PURCHASE PRICE FOR SUCH PRODUCT.

         4.   NO WARRANTIES BY IGT TO END USERS.  IGT is not making any 
warranties of the IGT product to end users.  CZO may, in its discretion, 
extend warranties to end users of CZO's product.  However, it is understood 
and agreed that IGT is not a party to, and does not bear any responsibility 
or liability for, such warranties by CZO to end users.

         5.   SERVICE OF WARRANTIES TO END USERS.  CZO has the sole 
responsibility and obligation to provide service and support on CZO's product 
to end users under warranties or otherwise. 



                                      SCHEDULE C

                        ATTACHMENT TO SALES AGREEMENT BETWEEN
                       CARL ZEISS AND IMAGE GUIDED TECHNOLOGIES

                                   FEBRUARY 20 1997




DISCOUNT SCHEDULE BASED ON PURCHASE OF [ ] SYSTEMS PER TWELVE MONTH PERIOD:

        # OF UNITS              DISCOUNT           DISCOUNT PRICE PER UNIT
        ----------              --------           -----------------------

            [ ]                   [ ]                        [ ]


DISCOUNT SCHEDULE ONLY FOR PURPOSES OF RECALCULATING PRICE FOR PURCHASE OF LESS
THAN [ ] UNITS OVER THE LIFETIME OF THIS AGREEMENT:

        # OF UNITS              DISCOUNT           DISCOUNT PRICE PER UNIT
        ----------              --------           -----------------------

            [ ]                   [ ]                        [ ]
            [ ]                   [ ]                        [ ]
            [ ]                   [ ]                        [ ]
            [ ]                   [ ]                        [ ]
            [ ]                   [ ]                        [ ]





                                  SCHEDULE D

                       IMAGE GUIDED TECHNOLOGIES, INC. 
                        COMPONENT AND ACCESSORY ITEMS 
                                FOR CARL ZEISS
                          EFFECTIVE JANUARY 1, 1997


- ------------------------------------------------------------------------------------
             ITEM                                        PART           LIST
          DESCRIPTION                                   NUMBER     PRICE ($  U.S.)
- ------------------------------------------------------------------------------------
                                                                   
FLASHPOINT-Registered Trademark- 5000M SYSTEM (230V)    500021           [ ]
- ------------------------------------------------------------------------------------
CONTROL UNIT, 5000Z (230V)                              121306           [ ]
- ------------------------------------------------------------------------------------
DYNAMIC REFERENCE FRAME, 120MM                          115106           [ ]
- ------------------------------------------------------------------------------------
SENSOR ASSEMBLY, 500MM                                  130556           [ ]
- ------------------------------------------------------------------------------------
FOOTSWITCH                                              110238           [ ]
- ------------------------------------------------------------------------------------
INSTRUMENT BREAKOUT BOX, 4 CONN/8 PIN LEMO              116649           [ ]
- ------------------------------------------------------------------------------------
LED 10 PACK, ISOLATED, AUTOCLAVABLE, 5T, 2 LEAD         123930           [ ]
- ------------------------------------------------------------------------------------
LED WIRING KIT                                          127433           [ ]
- ------------------------------------------------------------------------------------
LED SOCKETS, TETRA-ETCHED (10 PACK)                     116155           [ ]
- ------------------------------------------------------------------------------------
135MM PROBE, 2E                                         125714           [ ]
- ------------------------------------------------------------------------------------
SENSOR ASSEMBLY, 1 METER                                125095           [ ]
- ------------------------------------------------------------------------------------
DRF UNIVERSAL MOUNTING KIT                              115189           [ ]
- ------------------------------------------------------------------------------------
CABLE, 4 METER, LEMO/LEMO                               110439           [ ]
- ------------------------------------------------------------------------------------