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I use a Garmin Nuvi 65 LM. That is a £100-ish 6.1 inch 800x480 pix display unit that I have fully waterproofed myself using a tube of silicone and vinyl wrap. It's perfect, works in full on rain and with any gloves on.
Externally, just a thin strip around the screen where it meets the frame surrounding the screen. Rest of unit wrapped with vinyl, except the 5V MiniUSB power socket.and30ers Did you take your sat nav apart to apply the silicone or just apply externally??