Looking to import frequencys to my bcd436hp. Do I need different software than sentinal.
You don't *need* different software; as fxdscon states Sentinal has a copy of the whole database as of the last RR extract (which I believe is on Saturday or Sunday each week). But many people find that they prefer to use ARC536 or ProScan to set up their favorite lists and just use Sentinal for firmware upgrades. Both programs will import directly from RR as long as you are a premium subscriber.
For most folks the fact that Sentinal only gets a weekly snapshot of the database is no big deal, but if you happen to be in an area where a new system is being built out and there are lots of ongoing changes the ability to pull directly from RR may be an advantage.
My suggestion would be to download ARC536 and ProScan and give them a try since they both have 30-day evaluation periods. Then pick the program you prefer, whether it be Sentinal or one of the others.