Plotting Coordinates on map: Can't find functions 'geoshow' and 'kmlwrite'

Hello all, I use Matlab 2014a, and I've been trying for a while to plot a list of 800 longitude and latitude data on a map. For this purpose I first tried using geoshow, but got instead the error:

Console:
Undefined function or variable 'geoshow'.

Since this didn't work I then tried generating a KML file, so that Google Earth can plot the data for me. However the function 'kmlwrite' resulted in the exact same error. This was surprising to me, since so far I've never had trouble with absent functions.

Console:
>> which -all geoshow
'geoshow' not found.
>> which -all kmlwrite
'kmlwrite' not found.

I looked up some suggestions on similar problems and tried:

Console:
>> rehash toolboxcache
>> restoredefaultpath

But this didn't work either. If anyone knows a fix for this problem it would be much appreciated.

Laurens