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from my 850
Assuming you mean the 820 the general consensus seems to be that you should leave them all enabled (or at least, people disabling them seem to run into other issues later on as far as I can tell). The simplest explanation of the 4 maps (which are enabled by default) on the Garmin forum seems to be this...
INTL Standard Basemap, NR -> gmapbmap -> global basemap (no routing info)-> keep enabled.
Garmin Cycle Map EU 2015.10 -> gmapprom -> detailed map for display and routing. The "Garmin Cycle" map has detailed image and routing data. (You need this or an equivalent map for navigating).
Edge DEM Map EU 2014.10 -> gmapdem -> Digital elevation database map -> enable if you want to pick a generated route based on elevation.
Garmin Geocode Map EU 2015.10 ->gmapgc -> addresses to coordinates map -> enable if you want to select an address/etc to route to. Otherwise, it doesn't matter.
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Rod_Munch
dancing james
if i disable all the inbuilt maps and put in the old european city maps from my 850 it just crashes at the end of plotting a route and turns itself off
which of the inbuilt maps should i have enabled
it has on offer:
intl standard basemap
garmin cycle map eu
edge dem map
garmin geocode map
but when i use them now it is being fucking useless, telling me a 13 mile trip across london will be 34 miles long