I have prepared a map for Gosaikunda trekking from Dhunche. The map is overlayed by a topographic map purchased from survey department. A google earth file (.kmz) has been prepared (download). If you want to add more places, open the file in google earth to add them.
The kmz file can be loaded in Garmin GPS by copying the file in CustomMap folder of the gps device.
I hope this will be useful to all the trekkers and hikers.