The ERX-I (not shown) is the same ENOS receiver as the ERX-O. But he has an additional socket on the front panel to connect an external GPS antenna .
As a result, the ERX-I can also be used indoors / in a cabin because it receives its GPS position via the additional, external GPS antenna .
► Ideal for dive centers that want to set up the receiver in a cabin / indoor
► Super practical to use in a dinghy