Magnetometer mounting for isolation and interference reduction

A magnetometer mounting apparatus, comprising:

• a collar comprising a plurality of sections;
• a gap sub coupled between the plurality of sections;
• a magnetometer mounted in the gap sub, wherein the gap sub is electrically isolated from the plurality of sections;
• and
• a cover configured to seal the cavity in which the magnetometer is mounted, wherein the cover is positioned on an exterior surface of the gap sub and spans a portion of a circumference of the gap sub.

A magnetometer mounting apparatus, comprising:

• a tool insert;
• a mounting ring coupled to the tool insert;
• and
• a plurality of magnetometers coupled to the mounting ring, the plurality of magnetometer coupled around the periphery of the mounting ring;
• a collar of a drill string configured around the tool insert and mounting ring.

A magnetometer mounting apparatus, comprising:

• a tool insert;
• a plurality of magnetometers mounted radially on the tool insert;
• and
• connector ring configured to electrically couple the tool insert to a collar wherein a non-conductive coating or sleeve separates the insert from the connector ring and the connector ring from the collar.

A system comprising:

• a downhole tool housing;
• at least one collar mounted inside the downhole tool housing, the collar comprising a cavity;
• a tool insert mounted inside the collar;
• a magnetometer mounted inside the cavity, wherein the magnetometer is electrically isolated from other collars;
• and
• a hatch cover coupled over the magnetometer in the cavity, wherein the hatch cover is positioned on an exterior surface of the at least one collar and spans a portion of a circumference of the at least one collar.