If the computer is permanently mounted in a vehicle, shock mount it. Its life will be greatly extended. Also, do not connect SensorTrack tm inputs directly to 12 volts without protective series resistors and fuses. The charging system can see 35 volts or higher when jump starting vehicles, and this is enough to damage the sensitive computer if unprotected. Humidity and salt are not the computer's friend.
Computers can be slightly moisture resistant, though.
We put a Zip-Loc bag over the computer to block moisture, and use the stylus right through the bag. If the computer could be damp on the inside at the end of the day, backup the memory, remove the main and backup batteries, and leave the computer in a dry area for a day or so. Salt spray should not be allowed to get on the computer. If it does, it should be wiped off with a fresh water dampened cloth to prevent salt from getting inside. Salt is major enemy of electrical contacts. .