GPS is for navigators. Be they on land, sea or in the air.
Satnav is GPS that is dummed down by software for the masses so they can find a McD's/tesco's/the way to their mates house while avoiding speed traps etc.
I know someone (car driver), who says it shows him when a sharp bend is coming up FFS!
They all use the same data, but can display in differing coordinate formats.
Find yourself a nice cheap Garmin 276c in good condition and some extra memory cards and load it with SmellyBikers Wonderlust maps.
They are enough and you never know, you may be able to contribute back the Wonderlust DB.
John
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Nostradamus Ate My Hamster
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