How to Unlock a GPS Nav-Cam

Written by dan harkins
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One of the last devices made by United Kingdom-based Evesham Technologies -- before it went out of business in 2008 -- was the dash-mounted Nav-Cam 7700 GPS navigation system. The device also plays MP3s and allows you to view pictures in its pocket-sized display mount. To update all Nav-Cam models, contact another company, Tewktech. This is often needed to unlock new functions and to keep maps updated with current information.

Skill level:
Moderately Easy

Things you need

  • USB connector

Show MoreHide


  1. 1

    Go online to Tewktech's support site (see Resources) and fill out an e-mail form with information on you and your issue. Enter your contact phone number, or your form may not be accepted. Type in the alphabetical code at the end of the form and click "Submit Ticket." A staff person will contact you with assistance, including a link to any new software your device may require.

    You can "Create an Account" from the company's main Web page to enter a higher level of customer service.

  2. 2

    Turn on your Nav-Cam and computer after you've received the download link or SD card software through the mail. If you've received a new SD card, insert it in your Nav-Cam's SD card slot on the side of the device. If you've received a link, click on it.

  3. 3

    Connect your device to your computer with your USB cable. Click on the "Download" button or link for the software upgrade that Tewktech has sent you. Select "Save File" to put the upgrade file on your computer.

  4. 4

    Double-click your file after it has downloaded, then hit "Run." Follow the prompts to install the new firmware on your device, unlocking and overriding your old operating system.

  5. 5

    Unplug your device from its USB cable and test your improvements.

Tips and warnings

  • E-mail support is one of the only free services that Tewktech offers to Evesham customers. Tewktech charges for most service and upgrades.

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