NorthStar 2505 Installation Manual page 60

Glossary
WGS–84
Page 50
MF Medium Frequency band.
MHz MegaHertz, one million cycles per second.
MSB Most Significant Bit.
MSK Minimum Skift Keying (the type of modulation used by the
BDM, about 50 Hz shift).
Non-Volatile Memory.
NVM
Programmed Array Logic chip.
PAL
Pseudo Random Number (satellite ID number).
PRN
Random Access Memory.
RAM
RMS Root Mean Square.
Radio Technical Commission for Maritime Services, for
RTCM
standards and performance minimums.
SC-104 The communication specification for differential corrections
format.
TNC The type of connector used by the GPS antenna.
TTFF Time To First Fix.
VDOP Vertical Dilution of Precision
WAAS Wide Area Augmentation System (differential corrections via
geostationary satelliteS)
World Geodetic System—1984 (datum)
2505 INSTALLATION MANUAL, Revision A