What is the most common shipboard GPS receiver at the time of this publication?

The AN/WRN-6 is recognized as the most common shipboard GPS receiver during the timeframe specified. This receiver is designed for maritime applications and is known for its efficiency in providing accurate navigation data on naval vessels. Its widespread use can be attributed to its ability to integrate seamlessly with other shipboard systems, thereby enhancing the overall navigational capability of the fleet.

In contrast, other options like the AN/SRN-19, AN/WSN-5, and AN/WSN-7, while also GPS receivers, may not be as prevalent or widely adopted in shipboard configurations as the AN/WRN-6. Each of these alternatives has specific applications and features that may cater to particular needs or technological advancements, but the versatility and general application of the AN/WRN-6 have made it the standard within the maritime domain for GPS capabilities at the time noted.