Insert the pointed end of a spudger into the leftmost slit of the antenna case.
Push the spudger to the right.
Slide the antenna case out slowly or you may lose the antenna's spring. The spring is inside the black plastic that holds the antenna case to the device.
Slide the antenna case out of the device.
Reinstallation tip: first reassemble the antenna casing (place antenna back into its plastic cover), and then re-insert the entire assembly back into the GPS body.
Do not remove the ribbon cables without lifting the latch or the cable will be damaged.
Lift the latches on the ribbon cable connectors. All the ribbon cables may have latches. The right most latch may have a latch that flips in the opposite direction from the others.
Gently pull the ribbon cables out of their connectors. They should slide out easily.
Do not separate the two halves of the device yet or the on/off cable may be severed.