Nuvi 850 GPS coordinates issues

The menus on Nuvis vary from model to model, the examples below are for the Nuvi 56 but are probably similar on your Nuvi 850. The Nuvi 56 does not accept the '-' symbol when entering co-ordinates

I am assuming that in your example above that the first number is Latitude i.e. North - South and that the second number is Longitude i.e. West - East,
+38 is equal to North 38
-38 is equal to South 38
+108 is equal to East 108
-108 is equal to West 108

Nuvis allow you to input co-ordinates in 3 formats, they are :-

1) h ddd.ddddd
2) h ddd mm.mmm
3) h ddd mm ss.s

Key
h = N for North, S for South, W for West or E for East
d = Degrees . . . m = Minutes . . . s = Seconds

Your example is in format 1) so you would enter this :-

N38.85944
W108.71332

Nuvi 56 Menus
Where to >> Categories >> Coordinates >> [Spanner symbol] >> Coordinate format
Where to >> Categories >> Coordinates >> Enter Coordinates

 

If you have set the coordinate format to 1) h ddd.ddddd, then yes it is correct, however, if your Nuvi is the same as mine you should leave out the colons between N:3 and W:1