I am new to this forum and have recently bought a 2009 Avalanche C4. This particular model has a Mercmonitor monitor system and a GPS100 GPS unit.
The speedometer is driven from the GPS. What I have found is sometimes (not always) the GPS can take 10+ minutes to acquire a signal, thus making my speedometer inoperable during that time. This happens with the boat out in the open without any obstructions to the sky.
I had a conversation with customer support at Mercury and they claim that they haven't seen this problem before. However, they did say that there is a battery inside the GPS unit that may be bad, causing the GPS to take longer to lock onto a signal. They recommended that I replace the GPS100 with their current model GPS400.
Before I go and drop $400 on this new GPS unit, I wanted to check here and see if others have had a similar problem. If so, what do you do to fix it?