Equipment Considerations and Special Situations

 For GeoVISION™ Options and Attachments



Measuring and Recording the Camera Depth

Verbal or Visual Depth Recording

  • Footage is marked on all GeoVISION™ system cables.  One can record the camera depth on a DVD, VCR  or other recording device by speaking into a microphone. The audio information is added to any recording made using the GeoVISION system’s audio circuitry.
  • Most users who produce recordings of their borehole work prefer to have the depth record on the screen, and their customers appreciate this service as well. The On Screen Camera Depth Display (OSD) is standard with the Deluxe System and optional with the Heavy Duty Econo. It will place the camera’s depth in feet or meters in any corner or centered on the video screen and will appear on the recorded video. The depth indicator may also be turned off.  The footage counter encoder-wheel with clamp assembly and the OSD control box are part of the OSD attachment.

For more information, refer to the GeoVISION™ website:


Cable Reel and Winch

Manual or Power Winch Operation

  • The GeoVISION™ Econo Heavy Duty winch and Light Duty reel manually lower and raise the camera with a hand crank.
  • The Motorized Winch is standard with all Deluxe winches. It has a speed and direction control unit. The motor drive provides for a smoother video while lowering the camera. It allows a single operator to concentrate on observing the image on the screen and operating the controls. It is also easier to clean the cable as it is raised when using the motorized winch. It is one of the most valuable features when the camera is regularly sent to depths of greater than 650 feet (200 meters).


View in all Directions

Manual Camera Head Tilting or Motorized Pan-tilt Attachment

In small boreholes, viewing straight down is usually adequate. As the borehole size increases the number of occurrences when side viewing is helpful increases.

  • The manual camera tilting attachment is supplied with all GeoVISION™ Standard and Jr cameras. It allows the operator to pull on the power cable to tilt the camera head up or down when used in conjunction with a pipe string. The camera can be rotated allowing the operator to see in every direction including up. This method with a user-supplied pipe string is effective to 300 feet and sometimes workable to 400 feet. 
  • With the Motorized Pan-Tilt option the GeoVISION™ Jr. camera head can be tilted from down to almost straight up and rotated 360 degrees by remote control, to a depth of 2000 ft. You can look where you want, even up in 4 inch or larger boreholes; and see everything in one pass down the borehole. As a general rule, the larger and deeper the borehole, the more advantageous the motorized Pan-Tilt attachment becomes.  In the large and deep boreholes, this attachment is the best time saver available.

            For more information, refer to the GeoVISION™ website:


Viewing and Recording the Information

TV, LCD, DVD, or Combo

Many users own monitors and VCRs prior to purchasing a GeoVISION™ system. Therefore, we sell all monitors as separate items. Boreholes and voids may be viewed with many different types of monitors that are compatible with GeoVISION™ systems.

The monitor and recording options are:

  • Conventional TV – Any TV monitor with audio video jacks using the NTSC standard will work with GeoVISION™ systems. This is the standard used in North America, Japan and many other places.
  • LCD Monitors - These are very light and compact and allow viewing by more than one person at the same time. If portability is important, an LCD monitor should be the first choice. A 7 inch LCD monitor is available as an option with the GeoVISION™ system.
  • Sony DVD Recorder – A high quality DVD recorder.
  • VCR - any NTSC standard VCR will work with the GeoVISION™ system.
  • VCR TV Combination – The combo provides a convenient, low cost method of viewing the borehole and recording at the same time.  VCR TV combinations are widely available at most electronics retailers at prices form $110 to $210 depending on size, features, and retailer.  Marks Products can supply this item to customers who need to pay for the system using only one bill.
  • Converting the GeoVISION™  NTSC signal  to PAL or SECAM - GeoVISION™ users in counties that use either PAL or SECAM,  who want to be able to play the tapes on local systems, may get a converter, or a converting VCR that can play either.

For more information, refer to our website: 


Ultra Low Light and Supplemental Lighting

LED’s alone, Ultra Low Light Camera, or Dive Lights

  • All GeoVISION™ Jr Systems have LED lights intended for the common boreholes less than 12 inches in diameter.  An Ultra Low Light camera, supplemental lighting, or both will improve the viewing of larger diameter boreholes, mines, caves, and other voids.
  • The GeoVISION™ Ultra Low Light Camera is the most light sensitive borehole camera available anywhere. If a black and white image is acceptable, this camera is one of the best options. It may be interchanged with the color camera when using the GeoVISION™ Pan-Tilt system.

            For more information, refer to the GeoVISION™ website:


Supplemental Lights

GeoVISION has three battery powered supplemental light systems. 

Dual Light with two dive lights, brackets, and LEDs

Super Eight Light 2000 with 8 Mini Maglites and bracket assembly - 2000 feet

Adjustable Super Eight Light 2000 – 8 Mini Maglites and bracket - 2000 feet

When the GeoVISION™ Ultra Low Light Camera is used in combination with the Adjustable Super 8 Light, the resulting images will be the best of any system available for viewing and recording very large underwater voids. 

            For more information, refer to our website: GeoVISION™ website:


Power Source

Battery, Car, Inverter, Generator, or Commercial Power

The basic GeoVISION™ borehole camera systems can be operated from either 12 volts DC or commercial power with 120 volt or 240 volt; however, if additional equipment such as a VCR additional monitor, power tools and some GeoVISION™ options are used, additional power sources should be considered.  The power supply included with all GeoVISION™ units does not include a power source such a battery pack or generator.


The power source options are:

  • 12-Vollt Battery - The GeoVISION™ Econo configuration can be connected directly to a portable 12-volt battery or to a 12-volt electrical system of a car or truck using the lighter adaptor or jumper cables.
  • 12-Volt Battery - The GeoVISION™ Heavy Duty configuration requires120 or 240 volts to operate. This power may come from an inverter connected to a 12-volt battery.
  • Vehicle - An automobile or truck with a 12-volt electrical system connected using the lighter adaptor or jumper cables.  The GeoVISION™ Heavy Duty configuration requires an inverter in this situation. The vehicle engine may need to be run at least part of the time when the inverter is being used. An inverter is available as a GeoVISION™ option.
  • Generator
  • Commercial power either 120 volt or 240 volt

            See the specifications page of our website at


Refining the Information for Presentation

Video only, Video with Text, or Digital Presentation

Capturing the down-hole GeoVISION™ video image in real time on a personal computer

·         Some users of GeoVISION™ may wish to view the down-hole video image on a notebook, laptop, or personal computer or convert their downhole video to DVD later.

·         Video capture equipment available from many electronic and computer retailers will allow the analog video signal from GeoVISION™™ camera systems to be converted to digital or captured, viewed, and saved on your personal computer.

For more information, refer to the GeoVISION™ website


Please call us for help in building your custom borehole camera system to meet your specific needs.

800-255-1353 - Toll free from US

Phone 802-626-5302 -



Marks Products, Inc.

Home of GeoVISION™

Durable - Portable - Versatile - Cost Effective

Maneuverable and Small Cameras with High Quality Picture Resolution

Borehole Video Camera Systems Engineered for Elegant Simplicity