Garmin NUVI 1300 update maps

2017 .img file available via goolge search

format SD card and create Garmin folder
copy file into Garmin folder on SD card

to load map(s)
tools
settings
map
info
check map(s) you want


if more than one map then

GMAPPROM.IMG  for the Primary mapset 

GMAPSUPP.IMG  for the second

GMAPSUP2.IMG  for the third