Internal vs external aerial
I'm looking for a cheap-ish GPS unit for my boat, have found several that offer either internal or external aerials.
If i got one with an external aerial, does it have to be mounted on a horizontal plane? or can it be mounted off (about 20 degrees off level)
If i got an internal aerial, will it be affected by the wrap around plexiglass windscreen?
Which do people have, or would go for if given the choice?