Going Public - GPS Declassified: From Smart Bombs to Smartphones - page 99

Fig. 6.4. gps Block iir satellite. (Courtesy National Coordination Office for Position, Nav-
igation and Timing)
because it was about the size of a pack of one hundred millimeter, or king-size,
cigarettes. 61 Magellan followed with the first commercial handheld gps receiver,
the nav 1000, which resembled a walkie-talkie. The device measured about
seven and a half inches by three and a half inches, weighed less than two
pounds, and could track four satellites by automatically sequencing their sig-
nals on a single channel. 62 Trimble Navigation offered the Trimpack, a three-
channel sequencing receiver capable of tracking eight satellites. 63 Trimpack
had a slightly larger but flatter design than the nav 1000. Measuring roughly
nine inches wide by two and a half inches tall by eight inches deep and weigh-
ing just over three pounds, it could be held by hand or bracket-mounted on a