Timing of the test For all oxygen groups (i.e., Group I, II and III), initial testing must be done within the 30 days before the initial date of service. For Group II beneficiaries, recertification testing must be done between day 61 â 90 after the initial date of service.
Trolling motors are popular with anglers who want to be able to maneuver around a fishing area without disturbing the fish below the surface. When youâre searching for a new electric boat motor, keep these points in mind: 1  Most trolling motors operate on 12 volt, 24 volt and 36 volt circuits.
Combustion engines are measured in horsepower, and electric trolling motors are measured by the thrust they produce. Three decades ago, when they first appeared on the scene, 18 pounds of thrust was a big unit. Today, motors produce up to a whopping 165 pounds of thrust.