WordNet
n. a map drawn from observation (rather than from exact measurements) and representing the main features of an area
Usage examples of "sketch map".
They had done a sketch map of the lake and aside from the Chinese character notations and numbers, it was all quite nice and comprehensible.
Star told Rufo to pack, then squatted down with me at a sandy place by the stream and drew a sketch map--route south, dropping downgrade and following the stream except for short cuts, until we reached the Singing Waters.
Star told Rufo to pack, then squatted down with me at a sandy place by the stream and drew a sketch map—.
She was barely certain of the direction of the sunset, but she had no idea of distances and her memories of the sketch map which she had thought vivid and clear, had become fuddled and confused.
Inside was a typewritten letter, his Will, and two envelopes - one addressed to Sir Philip Gorde at the London Office of GODCO, the other marked: LOCATION AND SKETCH MAP.