Eventualmente você pode desejar apenas "fechar" o pacote ao invés de remover.
search()
# [1] ".GlobalEnv" "tools:rstudio" "package:stats" "package:graphics" "package:grDevices"
# [6] "package:utils" "package:datasets" "package:methods" "Autoloads" "package:base"
require(RgoogleMaps); search()
# [1] ".GlobalEnv" "package:RgoogleMaps" "tools:rstudio" "package:stats" "package:graphics"
# [6] "package:grDevices" "package:utils" "package:datasets" "package:methods" "Autoloads"
# [11] "package:base"
detach("package:RgoogleMaps"); search()
# [1] ".GlobalEnv" "tools:rstudio" "package:stats" "package:graphics" "package:grDevices"
# [6] "package:utils" "package:datasets" "package:methods" "Autoloads" "package:base"