- Joined
- Jan 1, 2000
- RO Number
- 824
- Messages
- 2,400
Nowadays there are advantages and disadvantages to both. R21 is light years ahead of the old NDS “high-site” system with the patchwork of radio consoles and Zetron recorders and standard “blink and you miss it” RDF’s, but it’s not quite as perfect as it’s said to be - especially in areas with a fairly even coastline and a nearshore transmission. Then even the most proficient operator that has the proper application open and knows what they’re doing will likely only get a single line of position, not a fix. Or two near reciprocals. Then your area of uncertainty is huge....
I'm a big believer on VHF on navigable waters over cellphone, as Coast Guard's RESCUE-21 system provides direction-finding by USCG. YMMV.
Cell phones reliably give their Lat/long to E911 PSAP’s, and some Sectors have the same technology. (That position MUST be converted from pure decimal to D/M.M or D/M/S!!! VERY important and often overlooked!) There’s also the impatient, ‘let’s just go find this guy and get back so I don’t miss Jeopardy’ way of getting all the info you can, and asking them to call 911 and ask them to call us with positioning data.

