Here are the specs for the HDS. copied from the Lowrance site. Lower, selectable kiloherz. The sonar power output is described differently than the others, so its a little hard to compare.
| HDS 5 |
| Sonar Frequency | 50/200 or 83/200 kHz |
| Transducer Type | Choice of dual frequency Skimmer® |
| Sonar Output Power | Max Max 250W Peak to Peak (31W RMS) actual; 30,000W Peak to Peak analog equivalent W |
| Sonar Depth | Max 5000 ft \ 1524 m |