I chose the lakemaster chip. I hemmed and hawed a lot over this question and spent about 90 min bugging the guy in the Cabelas marine dept in Rogers about it too. I was looking at Lakemaster Promap vs Navionics’ Prem. North 2007 chip. I fish 95% of the time on Vermilion so that was a major factor in my decision. This is a summary of what I found:
Cost: Navionics $149, Lakemaster 07-$99, 06 – $69
Map detail (of Vermilion): Navionics 1ft contours, Lakemaster 3ft contours
Road detail: Navionics No, Lakemaster Yes
Lakes covered: Navionics – Major lakes in several upper midwest states, Lakemaster: Major lakes in Minnesota
Ease of use: Navionics: Medium, Lakemaster- high
The main reason for my interest inNavionics was the map detail of Vermilion. The biggest 2 factors for my decision to get the lakemaster was the roads and the ease of use factor. The Navionics chip was considerably slower in refresh speed on my H2O and it was more difficult to zoom to a specific lake without actually being on it.
My 2 cents…