TDS COGO Survey Card and Overlay for HP 48GX Calculators

Enhance your HP 48GX calculator with the TDS COGO Survey Card and Overlay, the trusted solution for professional land surveying, coordinate geometry (COGO), and field data collection. Developed by Tripod Data Systems, this plug-in card delivers powerful surveying tools directly to your calculator, including traverse, layout, inverse, area calculations, and more. The included overlay fits perfectly on the HP 48GX keypad, giving you intuitive access to dedicated survey functions. Ideal for field surveyors and engineers, this module streamlines workflows and boosts on-site productivity.

Product Features: 

• Compatible with HP 48GX Calculators – Instantly expands functionality for field surveying
• Pre-Loaded TDS COGO Software – Includes routines for inverse, traverse, area, curve, and layout
• Snap-On Keyboard Overlay – Provides quick access to COGO functions with labeled keys
• Plug-and-Play Installation – No need for external software or configuration
• Field-Tested Accuracy – Trusted by surveyors for dependable results in rugged environments
• Compact & Portable – Easily fits in your calculator slot for mobile use
• Ideal for Land Surveyors & Civil Engineers – Streamline data entry and calculations in the field

Note: This is a refurbished item that comes with a 90-day exchange warranty. This has been serviced and calibrated to work as new. Servicing can include replacement of belts, gears, capacitors, cleaning and re-lubricating all internal mechanisms. Porter Electronics prides itself on only acquiring top quality used products that show minimal signs of use. Buying from Porter Electronics you should expect a very nice, refurbished unit. We do offer an extended warranty that can be purchased during checkout and will apply at the end of our already 90-day warranty

Porter Electronics also offers free tech support for those needing extra help. We offer a free digital download of the manual for this on this page in the “Downloads” tab. If you are unable to locate the link, just use our Contact Us page to request one.