bandwidth – The range of frequencies signal can carry.

barranca – A dry ravine or a steep depression between hills.

bar scale – The part of the map used to determine the scale of it. It is also known as linear scale.

baseline – The physical distance between base station and a rover receiver.

basemaps – The maps that are included when buying a GPS unit.

base station – A GPS receiver that is placed at a known location and that is used to collect and broadcast information to rover receivers. It is also known as a reference station.

bathymetric map – Type of map that measures the different depths across an underwater area as an ocean, sea or lake.

bathymetry – The measurement of depth of bodies of water.

bay – A body of water that is extending into the land.

beacon – Radio transmitter that sends signals in all directions. It is also known as non-directional beacon.

bearing – An azimuth; a horizontal direction of a line or direction of travel with true north or true south as a reference.

bench mark – A material object, natural or man-made, with a known elevation or horizontal location. Bench marks can be used as reference points when traveling a route or in determining the elevation of nearby land features.

bias – A systematic error that can cause true measurements to be different from observed measurements.

bitmap image – An image with 1 bit of color information per pixel, also known as a bitmapped image.

Bluetooth – A standard of radio technology that makes it possible to transmit signals over short distances between telephones, computers and other devices.

bogan – Canadian sluggish side stream. It is also known as logan pokelogan.

bosk – A small, wooded area.

bourn – A small stream.

bourne – Same as bourn.

BTGPS – Bluetooth GPS – See Bluetooth.

butte – Strange isolated hill that can sometimes have vertical steep walls and a small and flat top.