What areas do you fish specifically? I would rec. the Navionics + with SonarCharts and look for the preloaded version which will contain the all the data that Premium does across the US and Canada. Hotmaps Premium doesn't contain the SonarCharts data or layer the card isn't big enough. Plus the Nav + is a non region specific card, you download or add the high Def SonarChart data or layer to the lakes or areas that you fish.

To preview the SonarChart layer go to the WebbApp zoom in on the areas that you fish click on the Sonar Icon on the lower left corner fro SonarChart layer.https://webapp.navionics.com/?lang=e...y=w%60vqGn_vxP

The other bonus with bird you can Log Sonar and upload it to Navionics they will process the data making a map area or areas better then after a week you refresh your card with the new mapping. This service is available for a year with purchase of a new card.