In order to track GPS satellites, the unit must be situated with the antennapointed straight up and should not be blocked by objects or people (signalreception through thin fabric such as canvas may be adequate but degraded).A wrist strap is provided to prevent accidental dropping of your GPS 100.(Connect the wrist strap to the eyelet on the back of the unit.)Gimbal Mount Operation:A gimbal mount is supplied for fixed installation in a boat or land vehicle. Theunit may be operated using vehicle power through the power/data cable orit may be operated using the battery pack.While using vehicle power, you may wish to leave the battery pack in the unit.Vehicle power will automatically maintain the rechargeable battery pack atfull capacity. In the event of vehicle power failure, the GPS 100 willautomatically switch to battery power.In addition to supplying power to the unit, the power/data cable allows you tointerface your GPS 100 with other marine electronic devices such as plottersor autopilots (see Section 14.2 on electrical wiring).1.3 OPTIONAL ACCESSORIESThe following optional accessories are available for your specific needs:· Magnetic Mount Antenna Kit· Marine/RV Remote Antenna Kit· Personal Computer Kit· Carrying Case· AA Size Battery Pack· Data Transfer Cable (unit-to-unit)Marine/RV Operation:A Marine/RV Remote Antenna Kit is available for those installations thatrequire an external antenna for an unobstructed view of the sky. This kitincludes a remote weather-proof antenna and 30 feet of low-loss antennacable. The remote antenna has been constructed to thread onto a standard1" antenna mount. Antenna mounts, commonly used to attach VHF radioantennas and Loran-C couplers, are readily available from your local marineaccessories dealer.1-3