Finding a GPS receiver with dual GLONASS support, both an RS-232 serial female connector, and a USB connector, all for under $30, is extremely challenging based on historical product data. Devices combining these specific legacy (RS-232) and modern (USB) interfaces with multi-constellation GNSS (GPS + GLONASS) capabilities typically fall into a higher price bracket. The recommendations below aim to provide options that come closest to your requirements, often requiring some compromise on either connectivity options, the full dual GLONASS feature set, or the strict budget. Please remember that all prices, ratings, and availability are based on past data and are subject to change; you must independently verify all information before making a purchase.
These products offer a strong balance of multi-constellation GNSS capabilities and at least one of the requested connectivity options, providing good value for their typical feature set. However, meeting all specified features (dual GLONASS, RS-232 female, USB) simultaneously under $30 is highly unlikely, and some options may require additional adapters or exceed the budget slightly. Please independently verify all current prices, specifications, and availability, as this information is based on past data and is subject to change.
These selections prioritize the 'under $30' budget constraint, which often means compromising on the full set of requested features. You may find options that offer either GPS/GLONASS via USB or a basic GPS receiver with serial output, but rarely both with dual GLONASS at this price. Additional components or adapters may be needed to achieve desired connectivity. Please independently verify all current prices, specifications, and availability, as this information is based on past data and is subject to change.
These products represent historically popular choices in the GPS/GLONASS receiver market, often recognized for their performance or widespread use. However, due to the specific and challenging combination of features (dual GLONASS, RS-232 female, USB) and the strict budget, these popular options may not perfectly align with all criteria or might exceed the $30 limit. Please independently verify all current prices, specifications, and availability, as this information is based on past data and is subject to change.